Re: refacing mouthpieces
it could be anything - even a regular mouthpiece that you just want to totally redo - I have about 6 blanks for refacing, but I havent found time for them yet - all are just student model mouthpieces. blanks for the sake of being blanks look just like the mouthpieces that the manufacturer makes. I think you can get blanks from babbit, but dont know of any modern suppliers - you can also get used blanks, like buescher blanks or conn blanks, but those can be expensive. (for a blank.)
another thing for that kit that I forgot - you might want to get a few different tip wands so you can make a few of the different facing curves.