You mean the stud? I would soak the daylights out of it with PB Blaster for a day or so, then grab it with a vice grip and see if you can back it out. Why do you need to remove the stud?

I haven't looked closely at mine but sometimes the studs have a 6 point head on them at the very tip of the stud that you can stick a socket on and remove the stud. Which usually rounds off and you end up using a vice grip anyways, lol..