okay, So I tried to help a friend out by unsticking his main tuning slide and 3rd valve slides on his trumpet. Well I am not a engineer nor a repair technition, so I broke it. NO big deal, I told him the least I could do is to buy the parts to get it fixed. But I have no idea where to go to get them, nor part numbers to look for. Anyway, the horn is a Yamaha ytr4320st and the parts I need are the leadpipe and the main tuning slide. Thanks in advance for any help you can be.