Hi... not sure if this is the right place to post this, but here goes. I found an old trumpet in a thrift store, and was hoping to try and make it playable again. I looked up the serial number, and I guess it's from the 1970's, and also looks like it hasn't been played since then. It should be noted that I know very little about trumpets, and am just thrill seeking with this project. I surveyed it, and toyed around, and found that the keys would not budge, and there is some evidence that it could have been in some sort of basement flood, and not dried immediately, but there doesn't seem to be much rust, and I what I see could potentially just be some chipping. After looking online, it seemed the thing to get the keys to budge (and disinfect it) was soaking in a vinegar/water solution, so I did. After a few hours, it was certainly cleaner, but the keys were just as stuck as before. I have tried removing them from the casing, but to no avail; these keys do not want to leave. I searched around the interwebs, and found this forum, and now am looking for potential help. Might anyone have some information on this subject? Thanks in advance!