Just went to replace the batterys in my big-enough-to-bosh-an-intruder-over-the-head Maglite and can't get the end cap off. Left the batterys in there for a few yrs, oops.
So I tried heating cap and cooling the body, didn't work. Tried sitting it in penetrating oil overnight, no difference...reckon the rubber sealing ring stops it getting in. So dremel'd flat surfaces on each side of the cap and hammered on a 30mm spanner, no go. Got the big hammer out, bangbangbang f***in BANGBANGBANG...no go. Now I figure I probably need a vice to hold the body in so that I can get enough torque. Don't have a vice, before I go out to buy one just wanted to see if anyone had any ideas I didn't try. Don't like spending money!!