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d00kie,
I've never notice that bump in the sound before. Make sure that the metal tab on the base of the motor is making good contact with he positive plate in the car. If there is a little play in that contact it might cause something like that to happen. It may just be that with out the gears on the shaft, the core is moving in and out and bumping when it reaches one extreme (either all the way out or all the way in). If you are unhappy with it, I'll be happy to replace it.
Kyle
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