> Take a power drill, and a drill bit that is just slightly smaller than
> the stub. Drill into the stub; it should disintegrate enough to clean
> the remains out of the threaded bolt.
>
> --Gene

I had the same idea and did the same, but found that the stub did not
fall apart. Instead I just grabbed a smaller screw and used that in
the new hole in the stub. Its worked just fine for the past 3 years.

Dave