in a pickle any machinists?

If you have a Tig Welder you can most likely weld to it and get the extractor out. After you get the extractor out put a nut over the broken stud and start to build up material into and weld to the inside of the nut......... Use your wrench now on that nut and your broken bolt will come out. Wrench on it while it is still hot, not RED GLOWING HOT but right after it stops glowing.....Be sure to build the weld all the way to the top of the nut.

I had this happen to me a few months ago and the above worked perfect, I was all panicked like a mo fo and this process above made it cake..... Mig Welder won't do it though you need a TIG!