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Bottom_row + v_margin + 12; //knob_radius top_row = height - v_margin; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff working_height = height / 2 + hole_diameter + hole_margin*2; side_margin = (board_width - hole_hdist) / 2 + hole_diameter + hole_margin*2; cutout_width = board_width - (side_margin * 2.