Use this tool to install rocker arm bushings in rocker arms with or without press. This tool will install each bushing to the correct depth for the best oil control. Use the puller ZPN237339 for removing bushings, and ream to size with the line reamer ZPN235794. This rocker arm bushing tool works on 1966-1999 Big Twin, 1999 thru 2017 Twin Cam and 1957 to present Sportster.