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I would keep going with a bigger drill bit. almost down th the tread width. then you can use a bigger easyout. This worked for me. I kept drilling the hole bigger and bigger, and then the thought occurred to me that I might just be able to re-tap the hole. I used a bit that was almost the size of the bolt,without the treads, just a hair smaller. Then just screwed a tap coated with cutting oil into the hole, and presto, no more broken bolt.:D
rich