I've always lusted after the USN Voit style straight mouthpiece. When one finally went up on sale last April, I had to snap it up to update my FX non-mag project. I also managed to get some of the Kraken mouthpiece inserts, which got me thinking: Why not modify an ordinary Voit mouthpiece to incorporate the insert?
Using the USN mouthpiece as a guide, I made a mold that I used with some Sugru to make a place that I could attach the Kraken insert on. I didn't bore a hole in the Voit mouthpiece to lock on the insert. So far, it has managed to stay on the mouthpiece, but if it ever falls off, then maybe I can try screwing a replacement on afterwards.