I had a bolt that was broken below the hole this spring only it was a bolt that I could drill, but there was no way I could get it out with an easyout it wouldn't budge. I ended up haveing to use the tourch and VERY carefully melt the bolt out of the hole takeing extreem care not to ruin the threads. Then ran a tap into the hole to clean up the threads. If you are carefull it can be done , not easy and not my frist choice but that was the only way I could get mine out and I got lucky for a change.
Good luck on however you decide to do it.