When putting my valve cover back onto my F22b1 today I seemed to have either stripped the top left bolt itself or the thread it goes into.

I won't be able to tell which one until tomorrow, but what would be the best step for repairment in either case?

Now the bolt slides all the way down into the valve cover, loosely, instead of stopping about an inch short to be tightened the rest of the way.

Thanks for your help,
Alex