must disagree james,you carnt use your chisel method on a xjr jag,i know to my cost.ats erk used air gun on mine,they are two stage locking nuts and he only engaged the first stage.when he pulled the trigger and pushed,he wore away the second stage----f#cked.as they are deeply recessed into the wheel,i had to grind off locknut down to stud, then drill stud out.Shakey,when you get the nut off,replace them all,if ones worn the the rest have probably had some use,and as already posted get a socket and cracker bar