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If(shafthole_cutoff_arc_height != 0) { 2 * nothing, shafthole_cutoff_arc_height + 2 * nothing cube(cutoff_size, center = true, $fn = knob_faces); // Create a hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) .

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