I've been trying to get the screw under the trunk latch of my I/S out, the sumbich ain't moving! Tried the regular screw driver, didn't work. Tried heating the nut beforehand, didn't work. Tried grinding a bigger slot in the head so i could get a BMF screwdriver in there, no luck. Tried grinding the sides of the screw down so I could get a wrench on there, didn't work either. Seems like that thing is welded in there

So how do I get this POS out of there short of grinding the whole head down?
Thanks,
Barend