[WGPKnight]

So I'm currently rebuilding a cocker that's been sitting in a closet for years. I noticed that the LPR was not working correctly so I took it apart and found this on the tube...



The dry rot ate away at the o-ring and some metal plating has been chipped off. I can still see some slight "bubbling" around the damage. After a vigorous wipe-down, I can't get any more shards or flakes to come off my finger when scratched.

Do you think I need to replace this tube? What kind of lube should I be using on the new o-ring?

Thanks in advance.

[EvilAuthorityX]

regular paintball oil, the reg doesn't have any free moving parts so the finish really won't effect anything as long as it still seals

[DocsMachine]

Hate to say it but yeah, she's toast. Once the plating has flaked like that, the O-ring will no longer seal properly.

Technically, the main piston O-ring is below the flaked area you're showing, so you might be able to get a little more life from it with a fresh 'ring, but eventually you will have to replace it- and you might be chasing occasional creeping from debris contaminating the seals in the meantime.

Doc.