A screw with a stripped head & a special challenge
This is not a woodworking problem -- the screw holds together the case of a chainsaw -- but woodworking seems to be the most suitable topic to post in.
The challenge is that the screw is recessed in a well about 1/2" deep. It's a common design for tool cases with a left and a right half held together by screws. This makes the standard extraction technique impractical; inserting a drill bit in the well blocks the view so that I can't see what I'm doing. It makes most of the alternatives I've read about impossible, even in theory.
Have you successfully removed a screw in this situation? How did you do it?