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If you need accuracy of removal, probably the best bet is spark erosion, at a cost £££.
The difficulty will be drilling in the centre of the broken part.
freezing77-
Automatic centre punch?
Several hits. -
If you need accuracy of removal, probably the best bet is spark erosion
EDM doesn't get you any better than milling/drilling, your main problem is still accurate positioning. EDM is only necessary when whatever is stuck is too hard to attack with a carbide cutter.
JurekB
gbj_tester
It's in a tricky location thats why I wondered about "welding" glues. Pretty sure I've got some of that threadlock so will give it a go.
@JurekB - cheers. So any cobalt bit from a reputable brand will do the job.