Chuk, that is my point. We are talking about two different pulleys....the Karman is a 62, the EC is not. It is 61.9 and is referred to as a 61. Karmann is steel, EC is not. I still think the backing plate failure looks to be from the rivets cracking that material between rivets. I think at this point, Dave got it wrong by having the heading 62mm failures. Bob is on the right track, and I know Rudy has ran the original pulley thousands of miles with no failure. Something in the manufacturing had to have changed or inspections weren't adhered to. Standing by.....but, lets keep it to the point and please know which pulley you are referring to. EC stands behind their products and it looks like our Karmann builder is trying to do the same......