Yeah those are knurled to prevent turning when loosening the nuts to add/remove alignment shims, but yours probably rusted themselves in nicely.Adam wrote:Removing the upper control arms required more hammering. Normally you smack the studs out with a hammer. However, that wasn't happening. I had to apply some heat and hit it alot.
Let me tell you about the time (14-1/2 years ago) I thought it would be efficient to put a socket on the bolt head and crank on it to get them out.