Part TF3567 for products: 90064 CLASSIC TURRET PRESS and 90932 4 HOLE TP WI AUTO INDEX. This part installs inside the black auto index clamp on the steel ram. The square black ratchet rides on the 1/4"x 1/4" steel index rod. In order to maintain the integrity of the square ratchet, remember to raise the ram which disengages the ratchet from the housing and allows the index rod to spin freely. It is at this point that the Turret can be removed and installed at will. Put some household oil between the 4 hole turret and 4 hole turret ring to extend the life of your square ratchet.