Lots of potential solutions Hans.. all good ideas.. this is how I break these obnoxious ones loose..
First, get some freeze spray (usually available at an electronics store). You can also use a small bottle of NO2! Make sure you've got a nozzle you can control.. get a propane torch and gently heat the area immediately surrounding the bolt. Doesn't take too much! Direct your freeze spray on the exposed shaft of the stuck bolt. Only takes 3-4 seconds to chill and shrink the bolt. Get your vice grips on the bolt and remove it..
Good luck!
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