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One of my motors isn't spinning


Gravity Tester
Could be a rock or some dirt stuck between the stator and magnets which you can carefully remove. Otherwise it may be a broken bearing or bent motor housing and you'll be better off buying a new motor.
Ideally with C-Clip pliers but longnose pliers work fine. Make sure to do it in a zip lock bag as the c lip WILL go flying once you remove it!