I have a plan now for testing for internal leak by. I'll put the cylinder in my press and run it up to the ram. then I'll try to collapse the cylinder with the press if it moves, I have an internal leak if it doesn't, I'll consider it good.
[Linked Image from live.staticflickr.com]

I know a lot about a lot of things BUT I still have a lot to learn.
Life is what you make of it. So, why not make a working machine to make it easier.