I tried to remove a screw that was holding a metal curtain arm onto a window frame. It's right in the top left corner with wooden frame on two sides and the metal hinge just below it. I tried drilling it which was going OK until the hole went off centre and left me with a half moon shaped piece of metal.
Any ideas on how to remove it? Can't get pliers in there. No way I can get a grinder in there, have already broken 2 drill bits... :(
Nick