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Slide the pulley as far away from the motor as you the set screws still can fully grip the motor shaft .

The X pulley will be extending about 3mm (0.12'') beyond the top of the X motor shaft.

Tighten the set screws well.

Tighten as much as you can without damaging the thread (so called 'stripping').

Make sure one of the set screws is against the flat side of the motor shaft. This prevents the pulley from spinning around.