The 641-007 1 inch heavy retaining ring is a carbon steel clip used to secure the drive pulleys of the 4 and 6 inch wet sander drive pulleys on the shaft.
960-006WYA replacement yoke assembly. This is used on the S6MW and S660MW wet belt sanders.
This assembly includes the following: IDLER SPINDLE, IDLER PULLEY
WITH BEARINGS (WITH GROOVES), 2 LOCKING COLLARS, YOKE AND TENSION SHAFT