Thanks for the followup......I've messed up & fixed a fair number of
threads / stuck screws.
I think the reason the successive drilling worked out is that the
brass is so soft but that's also why the extractor didn't work.
A steel screw would have been more difficutl to drive but the
extractor would have bit (in a steel screw) rather than slipped as in
the brass screw.
To remove the debris you might consider a shop vac rigged up with a
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