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Hole; see knob_base(). Cylinder(h = stem_transition_height, r1 = stem_radius, r2 = stem_transition_radius, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = 3, center = true); hole_depth = max(knob_radius_top, knob_radius_bottom, stem_radius.

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