The Piston Ring Compressor is a particular tool that's especially made for restraining the piston rings when a piston is re-installed. Piston Ring Compressor Manufacturer tell you it is how to work. This can be accomplished by opening the piston ring compressor so the piston will slip into the opening. Subsequently the rings squeeze by tightening the instrument so it is snug around the piston. The piston ring compressor could be tightened by turning the adjustment arm clockwise, and hammering by turning the adjustment arm while holding the discharge spring down. It's very important to lubricate the piston ring compressor in addition to the cylinder bore with acrylic prior to trying to push the piston down to the cylinder.