There are 2-variations of the E2C that's referenced above. One that McGizmo (Don McLeish) created and the other that Doug Speck (Dspeck) created. Look for the thread in the Modified Forum that talks about the UBH (Universal Battery Holder).
Not highly published is another MOD (courtisy of McGizmo), which happens to be my favorite, which involves modifying the existing E2E bezel by replacing the pyrex lens, adding some o-rings and then extracting the P61 lamp from its reflector.
As recently as last night, using the instructions Don gave me, I was able to make my own modified bezel. Modding the P61 is very easy and it took me no time to do that. I've even gone one better than using Don's directions, whereas I don't even use heat to break the seal of the reflector to the lamp assembly. It's an awesome modification to the E2E/E2O bezel.