I've given myself the challenge of turning a trumpet and making it playable. I have most of the components turned except for the valves. My dilemma is what material to use for the valves. Although I'd like to use hard maple to match the rest of the trumpet, I'm concerned about movement of the wood and binding of the valve. The tolerances have to be very tight for the valves to function, and, although it won't be played very much, I want a functioning trumpet. I'm in the process of making some valves from Corian glue-ups but would prefer wood. Does anybody have any suggestions on what wood tends to move the least with humidity? Would an oily wood such as African Blackwood move less? I also have Osage orange and holly. Any suggestions? I'll post the final project when finished.