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JWestland-
Or alternatively.....
Using an automatic centre punch, punch a deep mark close to the circumference of the sheared bolt. Then, insert the punch into the mark, and punch tangentially to rotate the bolt. I've managed to remove a sheared 5mm Ø bolt from a seat post using this method, so an 8mm Ø should be easy.
JurekB
can you use screw extractor bit, or is the bolt too narrow?