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The barrel's arc has its centre across the axis, so its side is the inner (lemon) zone of a spindle torus, which SMLib's torus does not describe (its meridian is on the X side): SMLib (revolve-spindle) sweeps it as the exact rational surface of revolution. shell_of_a_revolved_barrel asserted an analytic torus of major radius -10. As the owner decided, it now asserts what matters: two flat caps and the curved side, the closed-form volume, 14 mm round at mid height, and after the shell the two offset faces (the inner wall and floor; truck's side was in halves). Needs SMLib with revolve-spindle (pin bump). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>