Maybe "weld" a handle /extractor to what remains with some strong epoxy and pull it out that way?
The other thing I'd try is a ceramic hole saw, the kind you normally use to put holes in tile,...
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Maybe "weld" a handle /extractor to what remains with some strong epoxy and pull it out that way?
The other thing I'd try is a ceramic hole saw, the kind you normally use to put holes in tile,...