Review on Proform 67448 Piston Ring Compressor by Star Bell

This does not work as I expected. I spent hours trying to figure out why the pistons wouldn't go into my engine. It turned out to be the tool. I had another ring compressor and everything came together easily. Because of this tool I had to buy another set of rings as the thin oil scraper rings loosened a bit before entering the cylinder and bent as a result (either the tool opens up a bit at the bottom or it's more than 4" which he says is ).