About a year ago I was looking though a local music store and I came across a huge case of used mouthpieces. I noticed this "big, weird looking one". Each mouthpiece in that case was $10, they were just trying to get rid of them because they had about 100 and didn't really know what to do with them all. I bought the "big, weird looking one" because I figured for $10 it was probably a good deal, because it looked expensive. Anyways, I've ran into a small problem with it. On my new horn the mouthpiece reciver has a bigger diameter and the Series 80 has to go in futher to fit, but with the extra metal thats added to it, it won't go in far enough and dosn't go in all the way! For the first time the other night I looked the price up on Warburtons website and now I am quite dissapointed to find out that I have a $150 mouthpiece that is compleatly pointless to me. So I have two options. 1) Is there any way I can add something the the shank of the mouthpiece to make it wide enough so that it will fit into my Kanstul without either messing up the tone or damaging my horn? Or 2) Is anyone looking to buy a Series 80 backbore that would be interested in trading for another Warburton backbore? I really like the cup/rim part of this mouthpiece, but it's pointless to me right now becuase the backbore/shank dosn't fit. So, after looking at Warbuton's site, I know I'm actualy getting the lesser side of the deal for trading for a standard backbore, but if anyone is interested, PM me.