those tricks didnt work. the ring is stuck that hard, i would only tear pieces out of it with a small screwdriver. i already thought it was glued in..
easiest way possible:
push it out!
screw the lens (oriented as usual, pinhole inside) into the module until its flush (so there is still some space between the pinhole and the casing inside) and push the lens in! i used a regular plastic pen, so it was a relative soft, round area to push in. after some good pressure (5 kg?) it snapped out, quite loudly! and, magic, no scratches on the lens! i now tread all lenses like this, but put a piece of tissuepaper in between. you never know..
i hope its understandable?
manuel