On that one I would use a deep six sided socket, the type that grips the flats. Breaker bar an a piece of pipe on the end of the breaker bar.WD40 overnight. As soon as the nut "cracks", 1/2 turn undo followed by 1/4 turn tighten. Helps to get the crud out of the threads, similar to tapping a thread. Make sure you don't snap the stud, otherwise you're buggered.
As a last resort use a nut splitter.
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