If it is a tiny bit too large, tap it with a hammer or squeeze it gently with a vice (parallel to the hex flats) and you should be able to get contact on 2 sides.
Or take a piece of round just smaller than the recess and carefully file a slot until it fits the flats. That should at least get you something to measure. If your smallest needle file is still a bit too thick, grind one side to thin it.
Is it sufficiently tight that a pair of tweezers (with the ends ground to suit and held tight/shut with perhaps small vice grips) won't turn the screw out? I have some tiny hemostats, but even if I ground the tips, I doubt they would work.
Or take a piece of round just smaller than the recess and carefully file a slot until it fits the flats. That should at least get you something to measure. If your smallest needle file is still a bit too thick, grind one side to thin it.
Is it sufficiently tight that a pair of tweezers (with the ends ground to suit and held tight/shut with perhaps small vice grips) won't turn the screw out? I have some tiny hemostats, but even if I ground the tips, I doubt they would work.
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