A cam-operated wrinkle band ring compressor designed to facilitate the installation of pistons by cutting friction in half. The wrinkle band prevents rings from slipping down into the cylinder, while the cam mechanism allows the adjustment screw to be set once for an entire set of pistons. This design allows for the insertion of a full set of pistons in half the time and with half the work.

A cam-operated wrinkle band ring compressor designed to facilitate the installation of pistons by cutting friction in half. The wrinkle band prevents rings from slipping down into the cylinder, while the cam mechanism allows the adjustment screw to be set once for an entire set of pistons. This design allows for the insertion of a full set of pistons in half the time and with half the work.