Brush holders made of nylon? Sounds like pretty weak design. All the parts I've ever seen made from nylon that involve force in one direction or movement, such as the brushes, have all worn out the nylon causing extreme slop. In the case of the brushes it probably causes the brushes move off axis enough to stop them working or even lock up the motor.
If the motor is meant to stay dry why would they not use bronze or something else?
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"The more I learn the less I know, but I never knew as much as when I was sixteen"
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