Joined: Jul 2015
Posts: 7,374
Likes: 3,219
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
the screw threads are corroded to the aluminum dropout... that is why the screw broke.
the stub sticking out is buggered up from attempts to do what so many say can be easily done.
the corrosion will need to be broken loose before that screw will ever turn.
drilling and a properly sized easy out is the best course, After more penetrant, and/or heat cycling is applied.
too much heating will damage the paint in a 1 to 2 inch radius... or more.