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The setscrew hole; see knob_base(). Cylinder(h = stem_height + nothing, = stem_radius, $fn = smooth // outer pointy indicator // cube size of 8 minimum to point out as specified. Cube([knob_radius_bottom, knob_radius_bottom, external_indicator_height], center = true); hole_depth = max(knob_radius_top, knob_radius_bottom, stem_radius) + nothing.

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