Folks: I have a lightweight Yamaha 6340, vintage 1986-87 with only a few small areas worn down to the brass. The horn has been well taken care of... no dings or other marks. I am getting it back from Anderson's following a valve job. When I place this old beauty beside a new horn the shine is a bit dull even after my best efforts to hand polish. Does anybody have any recommendation, short of a complete replate job, that can bring the finish back to close or near its original shine? I do have a buffing/polishing wheel but I do not want to do irreparable harm in the effort to do the impossible, (bring it back to a new/like new shine) if that's truly the case. If there is nothing that can be done - that's okay and I'll save the time trying - but I had to ask if anyone out there had any thoughts or recommendations regarding the possibility of bringing this keeper back to its original mirror like shine. Thank you!