i have all my stainless pieces of this type done locally by a fellow who repairs and rebuilds trumpets, tubas, french horns and the like. it takes him a while to get to it, but these guys have all the necessary tools, skills and the touch. if you have such a shop in your area, drop in and give it a shot. he did all the repairs for trim on my national a-1, a-38, tok 36-b, erie 71, etc