I just purchased a trumpet on Ebay and the second valve is stuck; it absolutely will NOT budge! I have oiled it very well and worked with it for hours, but it's as if it is frozen in place. What can I do to get it out? Also, is it likely that I may have to replace this valve? If I do, where could I possibly get a replacement valve for one that's over thirty five years old? ANY Input would be Greatly Appreciated!