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Additions. Cylinder(r1 = knob_radius_bottom, r2 = knob_radius_top, h = engraved_indicator_depth * 2, $fn = stem_faces); // Widening part at the end of the reverse. See Make Noise's Maths, Ken Stone's predecessor (Serge), etc. "Lightning bolt generator". See LMNC's dabbling in physical reverb using springs.

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