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we already had a damaged drill motor after someone dropped it. The clip holding the brushes in popped off so now the brushes are loose. We held them in using twist ties and locking them into the motormounts. I recommend putting your motormounts into a place that is protected by your drive chassis. As for the plastic/rubber connection to the drive shaft, I think that's supposed to wobble and have some give in it so when you run the robot, it can afford some flexing instead of breaking completely.
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