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Update: found
These are relatively few and far between, but I would like to purchase an American shank to Euro shank tuba mouthpiece adapter. Basically a very thin metal sleeve to go around the mouthpiece shank.
PM response preferred.
Thanks,
Marty

A few years back I picked one of those adapter from Wessex. It's a thin aluminum sleeve. Might want to contact them and see if the have one.

Got a Bruno Tilz adapter from a "local legend"
Well made and works perfectly for my needs.
Thanks to all!