ROCK-OLA troubleshooting:

GRIPPER REBUILDING:

It is best to take this completely apart. I find when it is seized that if you warm it with a hair dryer or heat gun for a while - until it is hot to the touch (not burning) - that this will loosen up the dried grease enough to disassemble.

You want to remove pin #14 (Driv-Loc) so #13(Gripper Arm Reversing Cam) can be removed from the shaft of #10 (Inner Gripper Casting). Watch that the internal spring #11 (Gripper Spring) doesn't take off!

Now you can pull off #12 (Gripper Arm Assembly - Gripper Bow), pull the other cams off, then extract #1 (Trunnion Shaft).

Wash everything with Varsol (solvent), then oil and reassemble.

Anything else just won't last more than a year or two before gumming up again.