I'm not really sure how it happened, but the head of B tension screw (Shimano DA 7800) got taken off when my chain broke (Wipperman link broke).
It's not a problem now, but at some point I'm going to want to remove the rear derailleur. The frame is Ti and the hanger is not replaceable.
Any thoughts on how to get it out? The top of the screw is flush with the eye it screws into.