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Measurement.) KnobDiameter = 20; // How much horizontal space needed for left-hand and right-hand sub-panels left_panel_width = 16.5+16.5+10.5; //two knob, one jack, plus space between them right_panel_width = width_mm - thickness; // additives - labels, etc // one more vertical to mount a circuit board sideways on HP = 5.07; // 5.07 for a.