Ground Control Problem.

This morning I jacked my car up to adjust the height and I found that the little socket where you put the Hex wrentch bit into was missing, it was just a hole. I can't untighten the lock or whatever it's called so I'm screwed. Is this replaceable? If so, do I just stick it in there again, or how do I do it? I musta just been stupid and forgot to tighten it the last time I adjusted the height.

If it's just the little set screw yes you can replace it. Just go to Morton's True Value or something like that and they should have one for like 2 cents.