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· Senior Slot Car Mechanic
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2,221 Posts
I wouldn't take the motor apart for that, just hook up some wires, and run it. Use a Dremel tool with a cutoff wheel in it to skim off about 20 thou from the end of the pinion.

Make sure the motor is running the opposite direction as the cutoff wheel for quickest cutting.

20 seconds tops to do this.

I have shortened pinions many times this way.
 
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