diff --git a/assets/locales/pending/tap-drills.json b/assets/locales/pending/tap-drills.json
index 591a54dfdb..985823c0f1 100644
--- a/assets/locales/pending/tap-drills.json
+++ b/assets/locales/pending/tap-drills.json
@@ -1,49 +1,35 @@
 {
   "en": {
-    "prefs.holes": "Holes",
-    "prefs.metric_tap_drill_major_less_pitch": "Metric tapped holes drill the major diameter less the pitch (M8: 6.75 mm), not the tap maker's drill",
     "thread.drill_range": "The tap maker's drill is {drill} mm. The internal thread's standard minor diameter is {minor} mm. A drill from {low} to {high} mm is accepted.",
     "thread.drill_range_custom": "The drill is the major diameter less the pitch, {drill} mm. The internal thread's standard minor diameter is {minor} mm. A drill from {low} to {high} mm is accepted.",
     "thread.drill_range_taper": "The tap maker's drill is {drill} mm. The standard's minor diameter where the thread ends is {minor} mm. A drill from {low} to {high} mm is accepted."
   },
   "ar": {
-    "prefs.holes": "الثقوب",
-    "prefs.metric_tap_drill_major_less_pitch": "تُثقب الثقوب الملولبة المترية بالقطر الأكبر ناقص الخطوة (M8: 6.75 مم) بدل مثقاب صانع اللقمة",
     "thread.drill_range": "مثقاب صانع اللقمة {drill} مم. القطر الأصغر القياسي للسن الداخلي {minor} مم. يُقبل مثقاب من {low} إلى {high} مم.",
     "thread.drill_range_custom": "المثقاب هو القطر الأكبر ناقص الخطوة، {drill} مم. القطر الأصغر القياسي للسن الداخلي {minor} مم. يُقبل مثقاب من {low} إلى {high} مم.",
     "thread.drill_range_taper": "مثقاب صانع اللقمة {drill} مم. القطر الأصغر القياسي عند نهاية السن {minor} مم. يُقبل مثقاب من {low} إلى {high} مم."
   },
   "he": {
-    "prefs.holes": "חורים",
-    "prefs.metric_tap_drill_major_less_pitch": "חורים מתוברגים מטריים נקדחים בקוטר הגדול פחות הפסיעה (M8: 6.75 מ\"מ) ולא במקדח של יצרן המברז",
     "thread.drill_range": "מקדח יצרן המברז הוא {drill} מ\"מ. הקוטר הקטן התקני של התבריג הפנימי הוא {minor} מ\"מ. מתקבל מקדח מ-{low} עד {high} מ\"מ.",
     "thread.drill_range_custom": "המקדח הוא הקוטר הגדול פחות הפסיעה, {drill} מ\"מ. הקוטר הקטן התקני של התבריג הפנימי הוא {minor} מ\"מ. מתקבל מקדח מ-{low} עד {high} מ\"מ.",
     "thread.drill_range_taper": "מקדח יצרן המברז הוא {drill} מ\"מ. הקוטר הקטן התקני בסוף התבריג הוא {minor} מ\"מ. מתקבל מקדח מ-{low} עד {high} מ\"מ."
   },
   "ja": {
-    "prefs.holes": "穴",
-    "prefs.metric_tap_drill_major_less_pitch": "メートルねじ穴の下穴を、タップメーカーの推奨値ではなく外径からピッチを引いた値にする（M8: 6.75 mm）",
     "thread.drill_range": "タップメーカーの下穴ドリルは {drill} mm です。めねじの規格の内径は {minor} mm です。{low}～{high} mm のドリルを使用できます。",
     "thread.drill_range_custom": "下穴ドリルは外径からピッチを引いた {drill} mm です。めねじの規格の内径は {minor} mm です。{low}～{high} mm のドリルを使用できます。",
     "thread.drill_range_taper": "タップメーカーの下穴ドリルは {drill} mm です。ねじ終端での規格の内径は {minor} mm です。{low}～{high} mm のドリルを使用できます。"
   },
   "zh": {
-    "prefs.holes": "孔",
-    "prefs.metric_tap_drill_major_less_pitch": "公制螺纹孔的底孔取大径减螺距（M8：6.75 mm），而非丝锥制造商的钻头",
     "thread.drill_range": "丝锥制造商的钻头为 {drill} mm。内螺纹的标准小径为 {minor} mm。可使用 {low} 至 {high} mm 的钻头。",
     "thread.drill_range_custom": "钻头为大径减螺距，{drill} mm。内螺纹的标准小径为 {minor} mm。可使用 {low} 至 {high} mm 的钻头。",
     "thread.drill_range_taper": "丝锥制造商的钻头为 {drill} mm。螺纹终端处的标准小径为 {minor} mm。可使用 {low} 至 {high} mm 的钻头。"
   },
   "de": {
-    "prefs.holes": "Bohrungen",
-    "prefs.metric_tap_drill_major_less_pitch": "Metrische Gewindebohrungen mit Nenndurchmesser minus Steigung bohren (M8: 6,75 mm), nicht mit dem Bohrer des Gewindebohrerherstellers",
     "thread.drill_range": "Der Bohrer des Gewindebohrerherstellers ist {drill} mm. Der genormte Kerndurchmesser des Innengewindes ist {minor} mm. Ein Bohrer von {low} bis {high} mm wird angenommen.",
     "thread.drill_range_custom": "Der Bohrer ist der Nenndurchmesser minus Steigung, {drill} mm. Der genormte Kerndurchmesser des Innengewindes ist {minor} mm. Ein Bohrer von {low} bis {high} mm wird angenommen.",
     "thread.drill_range_taper": "Der Bohrer des Gewindebohrerherstellers ist {drill} mm. Der genormte Kerndurchmesser am Gewindeende ist {minor} mm. Ein Bohrer von {low} bis {high} mm wird angenommen."
   },
   "ko": {
-    "prefs.holes": "구멍",
-    "prefs.metric_tap_drill_major_less_pitch": "미터 탭 구멍을 탭 제조사의 드릴 대신 바깥지름에서 피치를 뺀 값으로 뚫기 (M8: 6.75 mm)",
     "thread.drill_range": "탭 제조사의 드릴은 {drill} mm입니다. 암나사의 규격 골지름은 {minor} mm입니다. {low}~{high} mm 드릴을 사용할 수 있습니다.",
     "thread.drill_range_custom": "드릴은 바깥지름에서 피치를 뺀 {drill} mm입니다. 암나사의 규격 골지름은 {minor} mm입니다. {low}~{high} mm 드릴을 사용할 수 있습니다.",
     "thread.drill_range_taper": "탭 제조사의 드릴은 {drill} mm입니다. 나사 끝에서의 규격 골지름은 {minor} mm입니다. {low}~{high} mm 드릴을 사용할 수 있습니다."
diff --git a/crates/doc/src/thread_catalog.rs b/crates/doc/src/thread_catalog.rs
index a3d0e394a9..642c8b44fc 100644
--- a/crates/doc/src/thread_catalog.rs
+++ b/crates/doc/src/thread_catalog.rs
@@ -485,16 +485,6 @@ impl TappedThread {
         (self.minor_diameter().min(self.tap_drill), self.tap_drill * (1.0 + DRILL_ALLOWANCE))
     }
 
-    /// The drill a new hole of this size takes without a `diameter`: the tap maker's, or for an
-    /// ISO metric size with `major_less_pitch` (the preference that keeps the drill every metric
-    /// size took before) the major diameter less the pitch, to the micrometre.
-    pub fn default_drill(&self, major_less_pitch: bool) -> f64 {
-        match (self.family, major_less_pitch) {
-            (TappedThreadFamily::Metric, true) => ((self.major_diameter - self.pitch) * 1000.0).round() / 1000.0,
-            _ => self.tap_drill,
-        }
-    }
-
     /// Whether a hole of `diameter` mm can be tapped to this size; the error names the range.
     pub fn check_drill(&self, diameter: f64) -> Result<(), String> {
         let (lo, hi) = self.drill_range();
diff --git a/crates/engine/src/cmd/features.rs b/crates/engine/src/cmd/features.rs
index 99855d9ace..1729847255 100644
--- a/crates/engine/src/cmd/features.rs
+++ b/crates/engine/src/cmd/features.rs
@@ -2551,7 +2551,7 @@ fn hole(s: &mut Session, p: &Value) -> Result<Value> {
         }
         (None, Some(t), None) => {
             let size = solidcraft_doc::parse_tapped_thread(t).ok_or_else(|| bad(cmd, "thread"))?;
-            Expr::new(format!("{} mm", size.default_drill(s.metric_tap_drill_major_less_pitch)))
+            Expr::new(format!("{} mm", size.tap_drill))
         }
         (None, None, None) => return Err(bad(cmd, "needs `diameter`, `thread` (a tapped hole) or `clearance` (a bolt size)")),
     };
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index fc59770469..5d8fa083a4 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -377,9 +377,6 @@ pub struct Session {
     pub(crate) followed: Option<cmd::inspect::Followed>,
     /// Project a face's edges into a sketch created on it (the default; `sketch.auto_project`).
     pub auto_project: bool,
-    /// A new metric tapped hole given no `diameter` drills the major diameter less the pitch,
-    /// as before the tap maker's drills (a user preference); false: the tap maker's drill.
-    pub metric_tap_drill_major_less_pitch: bool,
     /// A new symmetric surface extrude given no `convention` reads its distance on each side, as
     /// surface extrudes did before they matched solid ones (a user preference); false: the total,
     /// split evenly around the start plane, as a solid extrude reads it.
@@ -651,7 +648,6 @@ impl Session {
             document_id: cmd::inspect::new_document_id(),
             followed: None,
             auto_project: true,
-            metric_tap_drill_major_less_pitch: false,
             surface_extrude_symmetric_per_side: false,
             param_check: schema::ParamCheck::Off,
             easyprint_upload: None,
@@ -702,7 +698,6 @@ impl Session {
     pub fn replace_design(&mut self, fresh: Session) {
         let auto_project = self.auto_project;
         let validation = self.validation();
-        let metric_tap_drill_major_less_pitch = self.metric_tap_drill_major_less_pitch;
         let surface_extrude_symmetric_per_side = self.surface_extrude_symmetric_per_side;
         let param_check = self.param_check;
         let easyprint_upload = self.easyprint_upload.take();
@@ -722,7 +717,6 @@ impl Session {
         // The user's, like `auto_project`: the commands that open a design evaluate it under it
         // already (`Session::opened_validating`).
         self.set_validation(validation);
-        self.metric_tap_drill_major_less_pitch = metric_tap_drill_major_less_pitch;
         self.surface_extrude_symmetric_per_side = surface_extrude_symmetric_per_side;
         self.param_check = param_check;
         self.easyprint_upload = easyprint_upload;
@@ -1480,7 +1474,6 @@ impl Session {
             document_id: self.document_id.clone(),
             followed: None,
             auto_project: self.auto_project,
-            metric_tap_drill_major_less_pitch: self.metric_tap_drill_major_less_pitch,
             surface_extrude_symmetric_per_side: self.surface_extrude_symmetric_per_side,
             param_check: self.param_check,
             easyprint_upload: self.easyprint_upload.clone(),
diff --git a/crates/engine/src/thread_tests.rs b/crates/engine/src/thread_tests.rs
index 7a9fea1265..755a98a2c1 100644
--- a/crates/engine/src/thread_tests.rs
+++ b/crates/engine/src/thread_tests.rs
@@ -1268,3 +1268,21 @@ fn a_modelled_tapped_hole_stops_clear_of_its_bottom_or_fades_out_before_it() {
     assert!(drill(6.5).contains("the tap cannot cut"));
     assert!(drill(7.1).is_empty() && drill(6.7).is_empty(), "inside the range");
 }
+
+/// A tapped hole given no `diameter` drills the tap maker's drill for its size (M8: 6.8 mm, 1/4-20
+/// UNC: 5.1054 mm); a given diameter is kept.
+#[test]
+fn a_tapped_hole_given_no_diameter_drills_the_tap_makers_drill() {
+    let mut s = Session::default();
+    run(&mut s, "solid.box", json!({"length":40,"width":20,"height":10,"body_name":"Plate"}));
+    let mut drilled = |p: Value| {
+        let id = run(&mut s, "solid.hole", p)["feature"].as_u64().unwrap();
+        match &s.doc.feature(id).unwrap().kind {
+            solidcraft_doc::FeatureKind::Hole { diameter, .. } => diameter.to_string(),
+            k => panic!("{k:?}"),
+        }
+    };
+    assert_eq!(drilled(json!({"position":[10,10,10],"thread":"M8"})), "6.8 mm");
+    assert_eq!(drilled(json!({"position":[25,10,10],"thread":"1/4-20 UNC"})), "5.1054 mm");
+    assert_eq!(drilled(json!({"position":[33,10,10],"thread":"M8","diameter":"6.9 mm"})), "6.9 mm");
+}
diff --git a/crates/ui-egui/src/dialogs_dense.rs b/crates/ui-egui/src/dialogs_dense.rs
index 3bddd55747..77767212c2 100644
--- a/crates/ui-egui/src/dialogs_dense.rs
+++ b/crates/ui-egui/src/dialogs_dense.rs
@@ -631,14 +631,7 @@ pub(super) fn rows(app: &mut SolveApp, ctx: &egui::Context, d: &mut Dialog, ui:
                 opts.tapped = tap == 1;
             });
             if opts.tapped {
-                enter |= crate::dialogs_thread::hole_rows(
-                    ui,
-                    &app.session.doc,
-                    &mut opts.thread,
-                    &mut opts.custom_thread,
-                    &mut opts.drill,
-                    app.preferences.metric_tap_drill_major_less_pitch,
-                );
+                enter |= crate::dialogs_thread::hole_rows(ui, &app.session.doc, &mut opts.thread, &mut opts.custom_thread, &mut opts.drill);
                 crate::dialogs_thread::hole_hand_row(ui, &mut opts.hand);
                 ui_kit::checkbox_grid(ui, &mut [("Full thread depth", &mut opts.thread_full_depth), ("Modeled", &mut opts.modeled)], 1);
                 // A modelled thread's inner end, towards the bottom, as the thread dialog's.
diff --git a/crates/ui-egui/src/dialogs_thread.rs b/crates/ui-egui/src/dialogs_thread.rs
index b3cf414937..55f05a7811 100644
--- a/crates/ui-egui/src/dialogs_thread.rs
+++ b/crates/ui-egui/src/dialogs_thread.rs
@@ -74,7 +74,6 @@ pub(crate) fn hole_rows(
     designation: &mut String,
     custom: &mut Option<HoleThreadDraft>,
     drill: &mut Option<String>,
-    major_less_pitch: bool,
 ) -> bool {
     let before = designation.clone();
     let designation_id = ui.make_persistent_id("hole_thread_designation");
@@ -170,13 +169,12 @@ pub(crate) fn hole_rows(
     form_row(ui, "Tap drill diameter", |ui| {
         match parse_tapped_thread(designation).filter(|_| custom.as_ref().is_none_or(|draft| draft.error.is_none())) {
             Some(size) => {
-                let default = format!("{} mm", size.default_drill(major_less_pitch));
+                let default = format!("{} mm", size.tap_drill);
                 let (lo, hi) = size.drill_range();
                 let mm = |v: f64| format!("{:.3}", v);
-                let args =
-                    [("drill", mm(size.default_drill(major_less_pitch))), ("minor", mm(size.minor_diameter())), ("low", mm(lo)), ("high", mm(hi))];
+                let args = [("drill", mm(size.tap_drill)), ("minor", mm(size.minor_diameter())), ("low", mm(lo)), ("high", mm(hi))];
                 let args: Vec<(&str, &str)> = args.iter().map(|(k, v)| (*k, v.as_str())).collect();
-                let id = match (size.taper_drill().is_some(), size.drill_is_tabulated() && size.default_drill(major_less_pitch) == size.tap_drill) {
+                let id = match (size.taper_drill().is_some(), size.drill_is_tabulated()) {
                     (true, _) => "thread.drill_range_taper",
                     (false, true) => "thread.drill_range",
                     (false, false) => "thread.drill_range_custom",
@@ -984,7 +982,7 @@ mod contribution_tests {
             let doc = Document::default();
             let _ = ctx.run_ui(Default::default(), |ui| {
                 egui::Grid::new("hole_catalogue").show(ui, |ui| {
-                    hole_rows(ui, &doc, &mut designation, &mut custom, &mut None, false);
+                    hole_rows(ui, &doc, &mut designation, &mut custom, &mut None);
                 });
             });
             assert_eq!(designation, original);
@@ -1135,7 +1133,7 @@ mod contribution_tests {
             let doc = Document::default();
             let _ = context.run_ui(Default::default(), |ui| {
                 egui::Grid::new("authored_hole").show(ui, |ui| {
-                    hole_rows(ui, &doc, &mut hole, &mut custom, &mut None, false);
+                    hole_rows(ui, &doc, &mut hole, &mut custom, &mut None);
                 });
             });
             assert_eq!(hole, original);
diff --git a/crates/ui-egui/src/documents.rs b/crates/ui-egui/src/documents.rs
index 8b9c351b5c..d6c3f565ba 100644
--- a/crates/ui-egui/src/documents.rs
+++ b/crates/ui-egui/src/documents.rs
@@ -158,7 +158,6 @@ fn swap_in(app: &mut SolveApp, mut slot: DocSlot) -> DocSlot {
     put_view(app, slot.view);
     // Preferences the session holds go with the user, not the tab (#680).
     app.session.auto_project = out.session.auto_project;
-    app.session.metric_tap_drill_major_less_pitch = out.session.metric_tap_drill_major_less_pitch;
     app.session.surface_extrude_symmetric_per_side = out.session.surface_extrude_symmetric_per_side;
     app.session.set_validation(out.session.validation());
     // So does the host's pre-command check: every tab is held to it.
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index e467206210..7f44c95ac2 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -978,9 +978,8 @@ impl SolveApp {
         if matches!(id, "file.save_mesh" | "file.send_to_slicer") {
             solidcraft_engine::slicers::set_chosen_programs(&self.preferences.custom_slicers);
         }
-        // The preferences the hole and surface extrude commands read, current even before the
-        // next frame applies them.
-        self.session.metric_tap_drill_major_less_pitch = self.preferences.metric_tap_drill_major_less_pitch;
+        // The preference the surface extrude command reads, current even before the next frame
+        // applies it.
         self.session.surface_extrude_symmetric_per_side = self.preferences.surface_extrude_symmetric_per_side;
         self.session.set_validation(self.preferences.validation);
         let t0 = now_ms();
diff --git a/crates/ui-egui/src/prefs.rs b/crates/ui-egui/src/prefs.rs
index 89fd87ba33..a37902fb5a 100644
--- a/crates/ui-egui/src/prefs.rs
+++ b/crates/ui-egui/src/prefs.rs
@@ -633,10 +633,6 @@ preference_settings! {
     /// Up/Down and the wheel over a focused value field step its plain number (`value_step`,
     /// #2320). Off by default: the keys move the text cursor and the wheel scrolls, as before.
     step_values: bool = false, PAGE_DESIGN => check_id("ui.step_values");
-    /// New metric tapped holes drill the major diameter less the pitch (M8: 6.75 mm), as before
-    /// the tap maker's drills; off by default: the tap maker's drill (M8: 6.8 mm). Saved designs
-    /// keep the drill they stored either way.
-    metric_tap_drill_major_less_pitch: bool = false, PAGE_DESIGN => check_id("prefs.metric_tap_drill_major_less_pitch");
     /// New symmetric surface extrudes go their distance each way, as before they matched solid
     /// extrudes; off by default: the distance is the total, split evenly around the start plane.
     /// Saved designs keep the reading they stored either way.
@@ -1130,9 +1126,7 @@ fn defaults(app: &mut SolveApp, page: usize) {
 /// the interface scale.
 pub fn apply(app: &mut SolveApp, ctx: &egui::Context) {
     apply_network(&app.preferences);
-    // The hole command reads the metric tapped drill rule from the session, Surface Extrude its
-    // symmetric reading.
-    app.session.metric_tap_drill_major_less_pitch = app.preferences.metric_tap_drill_major_less_pitch;
+    // Surface Extrude reads its symmetric reading from the session.
     app.session.surface_extrude_symmetric_per_side = app.preferences.surface_extrude_symmetric_per_side;
     // The features computed from now on are checked as the preference says.
     app.session.set_validation(app.preferences.validation);
@@ -2461,44 +2455,16 @@ mod tests {
         assert!(!solidcraft_engine::profile::enabled());
     }
 
-    /// New metric tapped holes drill the tap maker's drill (M8: 6.8 mm); the preference keeps
-    /// the major diameter less the pitch they took before (6.75 mm). It reaches the hole command
-    /// whether set through the control channel or the Preferences page, and a hole given its
-    /// diameter keeps it either way.
+    /// Preferences saved with a setting this version no longer has still load, every other
+    /// setting kept: the removed key is ignored like any unknown one.
     #[test]
-    fn the_metric_tap_drill_preference_keeps_major_less_pitch() {
+    fn saved_preferences_with_a_removed_setting_still_load() {
         use serde_json::json;
-        let plate = || {
-            let mut h = crate::scenario::Harness::new();
-            h.app.run("solid.box", json!({"length":40,"width":20,"height":10,"body_name":"Plate"})).unwrap();
-            h
-        };
-        let drilled = |h: &mut crate::scenario::Harness, params: serde_json::Value| {
-            let id = h.app.run("solid.hole", params).unwrap()["feature"].as_u64().unwrap();
-            match &h.app.session.doc.feature(id).unwrap().kind {
-                solidcraft_engine::doc::FeatureKind::Hole { diameter, .. } => diameter.to_string(),
-                k => panic!("{k:?}"),
-            }
-        };
-        let m8 = json!({"position":[10,10,10],"thread":"M8"});
-        let mut h = plate();
-        h.frames(1);
-        assert!(!h.app.preferences.metric_tap_drill_major_less_pitch, "off by default");
-        assert_eq!(drilled(&mut h, m8.clone()), "6.8 mm");
-        let mut h = plate();
-        h.call("ui.prefs", json!({"metric_tap_drill_major_less_pitch": true}));
-        h.frames(2);
-        assert!(h.app.session.metric_tap_drill_major_less_pitch);
-        assert_eq!(drilled(&mut h, m8.clone()), "6.75 mm");
-        // Only metric changes: a Unified size keeps its tabulated drill.
-        assert_eq!(drilled(&mut h, json!({"position":[25,10,10],"thread":"1/4-20 UNC"})), "5.1054 mm");
-        let mut given = m8;
-        given["position"] = json!([33, 10, 10]);
-        given["diameter"] = json!("6.9 mm");
-        assert_eq!(drilled(&mut h, given), "6.9 mm");
-        // A design opened or started keeps the user's choice.
-        h.app.run("file.new", json!({})).unwrap();
-        assert!(h.app.session.metric_tap_drill_major_less_pitch);
+        let saved = json!({"length_decimals": 4, "metric_tap_drill_major_less_pitch": true});
+        let p = serde_json::from_value::<super::Prefs>(saved.clone()).unwrap();
+        assert_eq!(p.length_decimals, 4);
+        assert_eq!(super::lenient(&saved).length_decimals, 4);
+        assert!(serde_json::to_value(&p).unwrap().get("metric_tap_drill_major_less_pitch").is_none(), "not written back");
     }
 
     /// New symmetric surface extrudes read their distance as the total, as solid extrudes do; the
diff --git a/crates/ui-egui/src/prefs/design.rs b/crates/ui-egui/src/prefs/design.rs
index 6dbaea3b4a..a517926e2a 100644
--- a/crates/ui-egui/src/prefs/design.rs
+++ b/crates/ui-egui/src/prefs/design.rs
@@ -36,10 +36,6 @@ pub(super) fn show(app: &mut SolveApp, ui: &mut egui::Ui) {
         let step = setting::step_values(app, ui).on_hover_text(tip);
         crate::scenario::publish_handle("prefs:step_values", step.rect.center());
     });
-    ui_kit::settings_section(ui, "holes", app.tr("prefs.holes"), |ui| {
-        let check = setting::metric_tap_drill_major_less_pitch(app, ui);
-        crate::scenario::publish_handle("prefs:metric_tap_drill_major_less_pitch", check.rect.center());
-    });
     ui_kit::settings_section(ui, "surfaces", app.tr("prefs.surfaces"), |ui| {
         let check = setting::surface_extrude_symmetric_per_side(app, ui);
         crate::scenario::publish_handle("prefs:surface_extrude_symmetric_per_side", check.rect.center());
diff --git a/docs/thread-catalogue.md b/docs/thread-catalogue.md
index 16c5787a81..fee88c67cf 100644
--- a/docs/thread-catalogue.md
+++ b/docs/thread-catalogue.md
@@ -27,10 +27,6 @@ cutting taps, printed p.704 (M, coarse) and pp.704 to 706 (MF, fine); M8 drills
 the pitch, to 0.001 mm (M8.5x1: 7.5 mm). This replaces the major-minus-pitch
 estimate every metric size took before (M8 6.75 mm). A saved design keeps the
 diameter it stored, so it builds as before; editing such a hole keeps its drill.
-The Design preference "Metric tapped holes drill the major diameter less the
-pitch" (`metric_tap_drill_major_less_pitch`, off by default) gives new metric
-holes that older drill again, in the Hole dialog and for the `solid.hole` command
-given no `diameter`.
 Custom metric dimensions remain editable, and Custom stays selected even when its
 current dimensions match a catalogue entry.