Indexing your crank to be sure it is "ABS" Absolute. Going through bearings all the time? We tested most cranks and the equivalent to running into a curb of flipping your car at high speed to jumping will cause the cranks to distort. A dead blow of 2 oz can cause a crank to distort .001 degree out of center and that is .002 over all in a 360 degree radius. I have seen cranks from the factory like this.