Originally Posted by: Dr_simon
II) the trem doesn't always return to tune if I have the bridge parallel with the body. I don't know the exact cause of this (maybe a worn knife edge) however it goes away if I raise the bridge a bit !

If it only happens when you raise the pitch with the trem bar , then I guess it's the springs falling a bit from their sockets due to less tension, then not always returning to exactly where they should .... I had that problem too a couple of years ago , and don't remember how did I solve it :p , but I guess removing a spring and screwing the rest more to the body might solve the problem.

I remember that I once saw an Ibanez that has a small metal bar that's screwed after the springs to lock them in place , may be you can get something similar to that custom in your guitar from a workshop.