Replacement Rocker Arm ConversionThis is a replacement part that upgrades the String Jaw system on Klipper USA stringing machines made in 1992 or earlier. If your machine currently has the Old Style (2 piece) String Jaws you can increase the holding power and eliminate string slippage by upgrading to the New Style (3 piece) String Jaws. This conversion kit includes a set of New Style String Jaws, 2 New Style Shoulder Screws and a new Tension Arm for your machine.