Installing cylinders onto pistons has always been a tricky job. Quit pinching your fingers and catching rings by using this handy piston ring compressor. It does the tough job of holding the rings tight in the piston so you can easily slide the cylinder in place. The compressor has a flared side to allow it to slide down the piston with the cylinder. This tool fits all 52mm to 85mm pistons and will withstand years of abuse for $29.95.