Posted by Chuck on October 25, 1999 at 18:54:23:
In Reply to: Re: Re: Re: Euphonium valve slide falls out! posted by Dave Seip on October 25, 1999 at 18:42:39:
Go to your local auto parts store and buy a small tube of Permatex Anti-seize compound.  Apply a small amount to coat the threads on your valve casings.  You'll never have a stuck cap again.  Same treatment works for mouthpiece screw rims and shanks.
A 2 oz. tube will probably last the rest of your life.  I've had my 8 oz. bottle for 25 years and haven't made a dent in it.  Believe the stuff is nothing more than superfine aluminum powder suspended in a heavy oil.