Well, not to open another can of worms..... At this point, I think a batch was produced that did not recess the rivets far enough into the plate. Once the plate started to wear, which it shouldn't have in my opinion, it started to heat up and wear on the rivets until a failure occurred. Just my take on it. Mine are recessed into the plate.... Plate isn't showing a lot of wear on mine either. Some of the failures you are seeing here had NOTHING to do with the Karmann pulley. But were the aluminum EC pulley. Lets not get them confused again. That is all I have to say... on it for now. WE will see what the builder has to say with actual facts about the failure.