Hello, My horn is a Strad., and a few years ago I noticed the threading on my 2nd valve was wearing and causing the valve to pop out when I'd press it down. So to keep it tight, I wrapped some tape around the threading so as to make the valve screw tight. This did work, but it's a pain whenever I need to take out the valve for oiling, etc. My question is has anyone else encountered this problem? If so, what's the best way to remedy it? Is it possible to fix without having to get a completely new valve casing? If so, is it expensive to fix? Thanks a bunch for any help!