My friction disk is 2 years old; it was used alot this winter.But the gremlins have obviously infiltrated my machine, and I have no understanding how a factory disk can wear like this? The previous one wore at an angle, but how would this wear in a "stepped" fashion? When I ziptie the traction handle, the plate seems to make full contact with the disk. There was no slippage at all this winter. Can someone explain this? I can't.