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I have used a dremel tool and a combination of carbide cone bits to centre the hole on extremely hard broken bolts and once centred, used a ton of drill bits to drill and enlarge the hole in the hole in the bolt.
Or
Take it to a machine shop.
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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