Hi Have a slight problem with one of my locking wheel nuts. I just changed 3 of them due to the nut that undoes them was starting to burr over and i was in danger of not being able to undo, well was in the process of changing them and guess what the last one that i get to it buggers up

so now i have three wheels with new lockers on and one with the old one that i cant get off

Dont really whant to buy a knew one just to get one off. Has anybody got any suggestions