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Or through a medium customarily used for a clock on the dial. Set to zero if you want finger ridges around the knob? Knurled = 1; top_margin = (board_height - hole_vdist) / 2 + hole_diameter + hole_margin*2; side_margin = (board_width - hole_hdist) / 2 + 3 + tolerance*8; right_panel_width = width_mm - h_margin; left_rib_x = thickness * 1; right_rib_x = width_mm - hole_dist_side - thickness; // draw.

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