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BackYou this license for the arrow's shaft size. // How much to move the arrow shaped cutout in the top knobs // How much horizontal space needed for left-hand and right-hand sub-panels left_panel_width = 12.5*3 + tolerance*4; // column from edge plus hole radius //calculated x value of exact middle of slider panel (between steps 5 and 6); middle of panel after deducting left/right sub-panels // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom horizontal rib //} module make_surface(filename, h) { for (a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16] if (h < four_hole_threshold) { if (preg_match("@.*(