This tool retains the cam rollers on EVO and Tier 4 engines in the PA positions not accessible for T81201 retainers. The long shaft is guided through the strongback and bottomed in the cam roller cup. The handle threads are tightened squeezing the "O" ring to retain the roller. The adjustable stop is positioned so the finger grips the edge of the strongback and prevents the tool and roller from falling through. This tool will retain a single roller so two will be required per power assembly.