I bought this kit to fit valve springs on a Kawasaki ZX6R. The product worked great; Clamp and thread are strong. It compresses the springs with very little effort. The 19mm adapter was perfect for this application. You have to be a little careful not to damage the machined hole in the bucket and bottom surface, but I think that's fine. A word of advice: wrapping the adapter in electrical tape and a rubber tip (or tape) on the exposed end of the screw can help prevent accidental impacts that could damage the machined part. This was my first experience so I cannot compare other products. I want the threaded rod that pushes against the valve to have a "leg" or pad; could make it a little more stable. However, it's okay. I am happy with the purchase.