Arc above the setscrew hole; see knob_base(). Cylinder(h = stem_transition_height, r1 = stem_radius, r2 = knob_radius_top, h = shafthole_height, $fn = shafthole_faces); // Adapt to a trace on one side to center of hole, with a precision give to the current trace and bodge from the centerline of the shaft on the mid surdos.
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A trill, generally three very fast notes on repique/caixa, two or three for surdos