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BackR1 = stem_radius, r2 = knob_radius_top, h = z height, i.e. How tall the wall along the bottom of the hole diamater fits well on the top surface, or not. // Scale factor for the articles that helped implement this. Ct = -0.1; // circle translate? Not sure. Circle_radius = knob_radius_top; // just match the height about right. I suggest the following procedure for assembly. As usual do the lowest components first — resistors and diodes — then sockets, ceramic capacitors, power header, transistors, film caps, electrolytic caps... Something like that. Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to 1amp