Thanks, Blake. FYI, my measurement if referring to the outside diameter of the shank's small end.

Are any of your remaining tuba mouthpieces large shank models (.550")?

Thanks for the info, Mark. I have 4 standard shank mouthpieces; Yamaha Roger Bobo, DW 3SL, Bach 18, and a no-name. The last two have throats that are larger than the first two, so I'll put more practice time on the Bach and the no-name. All of these will require me to use the adaptor so the shank ...

I'm looking for a mouthpiece to use on my Cerveny E-flat 641. More specifically, I would like it to have a large shank with a deep cup. My efforts with a standard shank plus adaptor have given me disappointing results in the low register. Advice and suggestions are welcome!

I had a piggy as well, for a few years. Used standard shank mouthpieces with it. I wonder if some markets got different sized receivers installed on their shipments.

I have a Cerveny 641 E-flat 4-valve tuba, and I'm using a standard shank mouthpiece with an adaptor. Without the adaptor, the mouthpiece shank slides almost completely into the receiver. When I measure the small end of the adaptor, my calipers measure very close to 0.550", which according to Matt ...

Thanks for posting this information. When measuring the shank size, do I measure the inside or outside diameter of the shank?

Here is a link to some pictures of the Besson 981.
https://www.kijiji.ca/v-view-details.ht ... cale=en_CA

EE-flat Besson Sovereign 981 tuba for sale; 3 + 1 piston valves, silver-plated. It has a 19” bell and a 0.681” (17.3mm) bore. Its serial number is 981-740926, and was built in England in 1986 or 1987. There are a few minor dents in the bottom bow, and some wear of the silver plating, but other than t ...