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- center_adjust; center_col = width_mm/2; vertical_space = height - hole_dist_top); cube([flange, flange, h], center=true); if (RingMarkings>0 for (i=[0 : RingMarkings-1] rotate([0, 0, 45] cube([2, 2, KnobHeight+.001], center=true); if (Pointer2==1 cube([8, 3, KnobHeight], center=true); if (style == "nut"){ // a round shafthole base.

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