Soak it with Kroil (or other penetrating oil of your choice) Give it a couple of days to work, then back off the slotted screw about a half to a full turn, lay the frame on a piece of hardwood with a hole in it that will clear the stud. Take another piece of hard wood , lay it on the screwhead that is protruding and whack it with a hammer.


Never has failed for me.......

__________________
Dean
SWCA #680 SWHF #446