I have a Dukoff tenor Super power chamber mpc. At the half way point of the table to the top rounded top part of the mouthpiece, it measures approximately 0.83" (Can vary by a few hundredths depending on where you locate the jaws of the caliper. Then at the same half-way table location, if you rotate the jaws 90 degrees, it also measures about 0.83" from side-to-side. If your friend's mouthpiece has similar dimensions, he can use an HSS1 Daddario Soprano H lig like I am using. This lig still has a couple of turns left when tight, but can open up quite a bit for a larger bodied piece.