Review on 💪 Enhance Performance with the ProForm 66766 Blue Adjustable Piston Ring Compressor by David Golden

The Proform Piston Ring Compressor keeps the rings compressed as the piston falls into the cylinder with jackhammer blows. Has worked every time, no oil ring is leaking. There's a fine line between tightening (don't think tight) without pulling the bolt through the back of the clamp. Sticking your fingertip in the gap while tightening will help. When it stops squeezing, stop tightening.