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(top_margin * 2); hole_horiz = (board_width - hole_hdist) / 2; standoff_radius = hole_radius * 2.5; standoff_height = 3; // tweak on this and/or Hagiwo's quantizer, if going digital ** https://note.com/solder_state/n/nde97a0516f03 and https://www.youtube.com/watch?v=op_DhPr2goc ** arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the section where the setscrew hole for mounting screw: ISO 1481-ST 2.2x6.5 C.

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