Valve threads slip
A valve cap jumps the threads if it isn't put on carefully. That is, it threads on straight, but apparently the cap is stretched enough that is only catches near the end.
Reply #1 - Jan 11th, 2006,
Thread replacement.
http://www.oberloh.com/gallery/peppereuph.htm
kenton
Reply #2 - Jan 11th,
it is good to know how it is done right.
Reply #3 - Jan 12th, 2006,
The threads of your instrument are worn and/or defective. The wear is likely to be on both valve thread and the caps.
My favorite solution to that problem is to remove the old threads on the valve totally, simply cut it off. Then I'd make a collar with new threads, and a solder recess that fits over the valve housing.
That would be a solution for both the top cap as well as the bottom cap. The crack at the bottom of the valve could develop up in the valve housing itself, so removal of the cracked thread, and a thread collar would help that problem too. It requires a lathe and the skill of making fine pitch threads on it.
Reply #4 - Jan 12th, 2006,
Although not a "repair" solution, I have found that swapping the caps around lessens the problem of skipping threads. I have some horns that certain caps only fit on their personal valve, and not on the others.