Originally Posted by Switch Blade
Ive noticed something very strange with my V2's. On both V2's that ive owned, bot of the brush tubes have bent at the end where the brushes contact the comm. I could never think of why this would happen.
As ShrekNZ says, it is because when you side-swipe the car against a barrier, or get T-boned, the armature pushes the endbell bearing out. This allows the tags on the comm to hit the tubes, and burrs them over.
The solution is to get some 1/8th id tubing - tough plastic or brass, not fuel tunbing - and put it as a spacer between the pinion boss and the can-end bearing. Now, when the armature tries to move, it is stopped by this spacer, and the tags don't hit the tubes. I allow a small gap (0.010") between the spacer and the bearing so the armature can still float in the can, but as soon as it tries to move any further, it is stopped. HTH