Stupid nut...

[cv2065]

Put another nut on the stud, screw it down and tack weld it to the other nut. Then unscrew both of them. JB Weld if you don't have a welder. Or, you could get a thin putty knife and see if it can fit under the nut and pry up while unscrewing. Or, you could cut off with Dremel...but that would probably jack up the threads. Or you could just replace the tie rod. Not that expensive and sounds like the threads may unusable anyway.