I did it once on a Schilke 66 tuba mouthpiece. It was a mistake and loss of money. I simply turned around and bought another one and used it for years. So it was like spending twice as much money for one mouthpiece.
I would suggest you just go to Doug Elliott, try several of his combinations, and see what the result is. If you end up buying one, you'll have saved yourself a lot of money in butchering perfectly good and fairly expensive mouthpieces, and you'll likely get what you want. Doug won't charge you to try anything -- just shipping, and he'll send you several alternatives to try.
Honestly, if you don't have a lathe and know how to use it, the chance that you'll end up with something other than junk is purely random. (And actually, the chance that you'll end up with junk even with a lathe is random.) Just having a good enough drill press vise to hold it correctly, align it with the bit, and then suffer from any wandering the bit will do, should give you pause. If you're thinking of doing it by hand, then I have to say you're just crazy. But you may find it worthwhile as a kind of "life experience".
That's just my opinion -- though keep in mind that I'm normally all about doing all my own modification work to instruments and accessories. But I know my limits (at least often) -- and I sure know the limits of my tools.
Last edited by ghmerrill; 09-28-2018 at 03:29 PM.
Gary Merrill
Wessex EEb Bass tuba (DW 3XL or 2XL)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE 104, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kelly 25
Schiller American Heritage 7B clone bass trombone (DE LB K/K10/112/14 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)