due to a ton of surgery on my head and face, I find a flat, whistle tip WAAY more comfy to use than the round mouthpiece on the Ody. I had some cartomizers kicking around from my Ego days with soft rubber mouthpieces that fit the Ody mouthpiece quite well, although a tad loose. A small zip tie around the base tightened the fit up perfectly, and the mouthpiece works very nicely now


