Pretty sure this one is threaded, David. It's on a Sarasqueta. Having done similar jobs on steel studs or bolts that have broken off flush with the surface I am home schooled in the process, and the importance of centering the drill for the pilot hole. Hadn't considered using a tiny Eezy-out, but that's something to consider. Didn't actually know they were available that tiny. I'll look into it.
Thanks for the re-assurance, Chris. I'm seriously considering investing in a high quality set of left hand drill bits, just for this purpose. Unless the threads are corroded badly (obviously not the case here), I would think a left hand bit might grab just enough to bring it out by itself.
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Threaded Mode