just use a castle nut wrench and twist it off. the staked bit of metal will shear off, then when you put it back on re-stake it. i use an old punch that fits in the stake slot. i sharped the punch for the job.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith