TubeNet

Your buddies must be trumpet players!

No--there's no effect that I can tell on a tuba mouthpiece.

Indeed, I found no difference on my Doug Elliott set up at all.

CB

They DO make a difference in tone solidity to VARYING degrees w/VARYING players.
If there is ENOUGH thread contact (with excellent design AND machining behind it...), it won't make THAT much difference to MOST of "us"...

Enough already!
buy my Eb's!