I modded my 2AA last week with a P4 and could not really notice a difference. Maybe the lottery I guess as I thought it was good before hand, only a bit weak. As to getting in, the black ring will come off with a lot of coaxing. I did damage my light, but I beat it up in my tool bag and don't care. If I tried, I could of heated the head a bit as there is some type of loc-tite on the black ring. It now wants to pop off, but I have not applied loc-tite to it. It is a simple mod after the head is taken apart. I wish I still had access to SMT resistors from my old job and would of tried fooling around to get more output, but no biggie, I still enjoy the light. I tred taking pictures, but my photo ability (lack of) combined with my work camera don't make good pictures.