Review on 💪 Boost Efficiency with the Proform 66785 Piston Ring Filer Manual by Ben Rodriguez

Absolute bullshit. I bought this ring filter to overhaul a BMW engine and I really regret it. The grinding wheel wobbles back and forth, making a clean cut absolutely impossible. Even if you manage to cut a ring perfectly, the chances of all rings being the same are extremely slim. In addition, the molybdenum coating is more prone to chipping, causing even more problems. Because of this I now have to buy a new set of rings and a new filter. Buyer Warning.