(moved from engine section)
I have a friend in the Bay Area with a 93 500E and he can't get his key to turn at all. He replaced the neutral safety switch and the problem remains. He can't turn the steering wheel or move the gear selector out of park. The battery is fully charged.
I checked peachparts and got some good ideas. It appears that the back side of the tumbler is accessible by pulling the instrument cluster. Maybe a chisel hammer or some sort of air vibration tool on the back of the tumbler while trying to turn the key will work.
Anyone had luck with this or any particular technique for a stuck key?