I have a made in China copy of the Guardala Fatboy (tenor) and really like the mouthpiece. It's pretty close to the original, which I owned years ago. Anyway, I also use a solid silver neck (from the same company) and either the mouthpiece is too small, or the neck is too wide, or a combination of both. I sanded down the cork to where I can play in tune, but so much cork was removed it's starting to show the silver neck in spots. No leak so far but I'd like to repair this. I'm wondering if there's a super thin material that I can use on the neck, or worst case have the mouthpiece reamed out a bit. I don't know if I would trust myself on the process though. Any ideas?