hmm,, thats a tough one Pat,,i believe the screw is made of brass (some are in my ab's)
so it's kind of soft, a use of a drill is not an option might ruin the threads
i have used a tool to remove broken screws,it has been on cars and bikes
so i'm not sure it would work on this small details,,
anyhow this is the way it works ,,you drill a hole in the screw and
screw this in the threads are anti-clockwise on this so it will eventually losen the broken screw,,,
i don't know if there are such small tools that fit in the small opening
you have in the screw,,,
He,,he,,Pat i think our english speaking friends have good laugh when reading this
two not so good at english trying to have a conversation,,
i hope you understod what i was trying to say.
/kimmo