There a prick of a thing
iv had like 3 sets jammed over my time
iv tryed every thing from multi grips and getting Arnie to come help squeeze them on, you must a good set of multis for this, not the old stuffed out set in a water filled tool box
to using a blow torch trying to heat the nut
most of the time is all about getting the open end spanner on the right way, 1 way it will strip easier and the other way it will grip more and getting the revolution of wheels in right spot and applying hand brake
its just a prick but persistence gets it