Chosen Solution
I have a stripped screw inside of a tube (see picture):
The size of the screw is M2 and it seems to be glued. This is part of a camera objective so I want to avoid impact (e.g. tapping with a hammer). I’ve already tried using a rubber band, but the screw head is too deep to reach (2-3 mm). My only remaining idea is to try to use a left-handed drill. What size of drill bit should I use for best results? Should I pre-drill a smaller hole in the center? Are there any alternative methods to try? The lens assembly has a mechanical problem which will soon render it unusable so eventually I might try something more risky.
@guideneon not sure how much room you have in there but I would try a Dremel like tool and cut a slot into the screwhead. Then use a nice sharp slotted screwdriver. For the drilling part you would need to get smaller then the screw diameter. Otherwise you just drill the screwhead off. If it is a M2 thread drill with a 1.6mm drill which is the tap size for this. That might move enough material to loosen the screw.
