I understood from this board that aluminum extensions generally did not work on G2's. Some members mentioned using aluminum foil to bridge the contact from flashlight body to extension. I have a G2 I had not been using and the other night I realized I had an extesion for a 6p or 9p I was also not using , so I decided to try it on my G2. I bent a small paper clip into a circle to match the interior of the extension and cut the ends so it would not overlap. I pushed it past the threads onto a "shoulder" inside the extension. "It's ALIVE!". It works great! Everything screws down tight and it works. I feel like I have a new light. It looks a little Frankenstien-ish, nitrolon and aluminum, but I dont mind.