I have a Makita belt sander model 9924DB. It is for 3" x 24" belts. I
have noticed that the Tension Roller is not turning when the unit has a
sanding belt on. I then noticed that the roller is difficult to turn by
hand. So I took it apart and cleaned up the roller shaft, the 2 cup
washers, and the roller.
I have 2 questions:
1- What should I use to lubricate theroller assembly?
2 - What is the size of the retailing ring that goes on the roller
shaft? My parts list only says Part # 66, retaining ring s-12.
Unfortunately the retaining ring went flying across the garage and is
not to be found.

Thanks for all your help.