I never seen that happening or being the cause of a rotor to go , check the rotor on your wagon down between the fingers , see if you can see a dip worn in the steel from friction between the fingers , it would be the shape of the back of your finger nail . A friend of mine who has a gigga2 has built his up with weld the whole way around , it's a lot of welding . But it has extended the lifespan of the rotor .the fingers are dropped into slots cut in to the rotor, cracks spread from one slot to the next until it snaps or implodes. what do you mean by wore its rotor through?