Review on Mount 66784 Spring Compressor Rocker by Christopher Gotcher

What else can I say? I did all the valve gaskets on the small compressor block while it was still in the car. I had a little trouble fitting the clip onto the locking pin when I reversed the stud mount, but I replaced it with a snug fitting o-ring. The thing is nonsense when it gets tight, like next to the brake booster. Simply tighten the C-lip and pin, screw in the bolt and top mount the compressor. I didn't manage to "fix" it in a compressed position, nor did I really want to try. All in all a very solid tool that looks like it can handle any size spring you might be using in a GM.