Purchased this T1 about 3 years ago ...decided to change battery, and can not remove the battery cap. I have contacted Aimpoint but no reply yet. Looks like the battery cap is either cross threaded or perhaps the O-ring has slipped into the threads...but whatever, is frozen solid. I have tried with vise grips over tape on the outer ring (but need to be real careful not to distort), and a coin in the slot with a wrench. No Luck. I am thinking a hose clamp on the outer ring might help a bit, but.... any suggestions?