I've been enjoying the used TR300 I got for my birthday a month ago, building my embouchure back again slowly. It's been 24 years, so the memories are there but not the muscles. The trumpet sounds great (to me). When we tested it in the store, it sounded and felt better than anything except the Bach Strad they had, and the price leap there was more than I'd wanted. I've had a few troubles with it, though, all with the valves. For a while I was using valve oil constantly, though changing to Hetman's "classic" from the watery stuff that came in the cleaning kit helped a lot. The one problem that's continued after that is slow motion on valves returning to the up position, making for strange sounds, especially on slurs. I ordered the TR300 rebuild kit from The Bandroom, mostly for the springs, though new pads will be nice too. I replaced all of the springs and the action has definitely improved. The springs are a lot noisier, though, and I ended up putting some slide grease on them to quiet them a bit. On the third valve, I also replaced the nylon piece, and I'm not sure that was wise. The old one was kind of worn, but this one might not be worn enough. Going forward, my main questions are: * Should I replace the other nylon retainers? * Will the springs just quiet down on their own? I was also looking into replacing some valves, but at $91.60 each (the Bandroom - haven't looked around yet), I'll wait on that and see how this goes - so far, so good! (And why are Bach Strad replacement valves $10 less than TR300 valves?) Thanks!