Or If you weld or have someone nearby who does, A nut can be welded on the stud, from the inside of the nut. Then taken out with a wrench. The heat of the welder also helps loosen the stud. This is assuming you have it sheared off at the base..... If not, and you can get some vise grips on it. Some heat, tapping on the stud and some back and forth with the vise grips and you should be able to get it out.