So I've been hacking away with my (relatively) new CarolBrass pocket trumpet. Love the sound and feel, but... honeymoon is over. It builds up spit or condensation like a rainforest, which I've figured out how to deal with. The 1st valve slide rattles because it's so loose. Fixed that with extra slide goop.
But this last one has me stumped. The 2nd valve sticks down, even when I've just oiled it. What I've discovered is the valve itself rotates a tiny bit even after I "locked" it in after oiling. (You know how you rotate it a bit after oiling until the little pin thingy falls into it's slot). So when it gets rotated slightly as I'm playing, it gets stuck down. What do I do? My old student horn's valves rotate a tiny bit but never get stuck.