I'm going through this process right now. I have 3 remotes, all currently disassembled and waiting for new o-rings. I don't plan on doing this again, or repeating it because I missed something, so I ordered every o-ring, about $175 dollars worth. The o-rings around the primary and secondary shuttles are what jumped the price up.

What I found when I tore it apart was the rings around the primary and secondary shuttles to be 80% missing. Everything else looks good. Knowing that, next time I would probably take less apart because trying to keep all the parts organized and free of dirt is a challenge.

Note: Secondary Shuttle Valve has a ball bearing sitting between it and the valve housing, don't lose it.

(Shuttle valves.jpg)

Shuttle valves.jpg (51KB - 225 downloads)