Review on Proform 67448 Piston Ring Compressor by Tutcht Cobb

At first I thought it was a bad product and filed a return with Revain. I called a friend who was an engine builder and asked if he could borrow his V-ring compressor. I told him about the problem I was having with it and he was quick to tell me that it doesn't fit on the cylinder but is aligned with the cylinder. All 8 pistons used without problems. This is a very good product.