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45] cube([2, 2, KnobHeight+.001], center=true); cube([RingWidth*.5, MarkingWidth, 2], center=true); cube([8, 3, KnobHeight], center=true); // Pointer1: Offset hemispherical divot sphere(r=DivotRadius, $fn=40); // Divot1: Centered cylynrical divot // Divot1: Centered cylynrical divot // Divot1: Centered cylynrical divot // Flat for D-shaped hole // begin arrow top cutout cylinder(r=8, h=10, $fn=3, center=true); for (z = [0 .

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