My comment cited by Jeff was not 100% correct, hence I deleted it - while he quoted it
....here the correct details:
If you would be able to over-tighten the axle bolt thus applying too much clamping pressure you actually could push the top-hat too hard against the inner race that has no support from the cam socket. In the cam socket there is at the outer diameter a small edge that defines the position of the outer race thus giving the inner race theoretically some play.
However, the axle has a defined fix length, and when you remove the axle bolt you see that it reaches just approx. 1-2 mm to the edge of the limb, and these 1-2 mm are taken care for by a collar on the washer for the axle bolt. Thus the clamping length is fixed.
I get this that the limbs may have some tolerances (especially due to slightly varying the coating thickness), however, this in order of micro meters, not millimeters. And lets not forget that it gets tighten with a 5/64 Allan key ....I use a little bit of blue Loctite and tighten it till I feel a slight / minimal resistance (I would be scared ruining the little bolt head if I would do it otherwise).
IMO if it is too loose it can do more damage as it would allow the top-hat and the cam to move on the axle - that's definitely not a good thing to happen.
The damage I could recognize when observing the ball bearings under a magnifier clearly points to ball material that is too soft!
I also experienced some wear and tear on the top-hat the first time I had the issue with the cam. The damage was clearly from the collapsed bearing. The top-hat was damaged as the axle was tilting (excessive cam lean! watch out for this) as the bore in the middle of the cam is approx. 0.6 mm wider compared to the bore of the inner race. This together with the debris from a collapsed bearing will cause the wear and tear of the top-hat.
The damage of the bearing is caused by nothing else than poor quality of the bearing balls: take a bearing ball, look at it under a magnifier and you will see that it is covered in pitting marks - looks like every shot I made left a pitting mark, some of the bearing balls look like hammered. I looked a little bit deeper in this issue when the already replaced cam for my Traverse failed again after approx. just 3,000 shots. Long DL, high poundage ...and there is a 50% chance that the bearing will fail prematurely due to the poor quality of the bearings balls.
If you want to replace the bearing: the bearing can be easily pulled out (you can't push it through like you can do with some of the Elite) when you warm them up a little bit with a heat gun (don't go overboard!) and a snap ring / circlip plier.