Use a bolt extractor socket that fits overtop of the outter rounded edge... press/turn until it begins to bite into it... the more you turn it the tighter it will grip until is comes out.
Any tool place should sell them....
Something like this - Amazon.com: Irwin Industrial Tools 394002 Bolt-Grip Expansion Set, 5-Piece: Home Improvement
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Previously owned:
2000 Boxster S 3.2 Ocean Blue / 1974 911 Targa Silver
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