The top bolt would thread all the way in by hand with no issues. Then the next time it would bind up. Rather than risk knocking another nut off I decided to clean the threads out with a tap. I don't know what was in the threads but I mounted the sway bar 3 or 4 times before the bolt went in. I tapped and sprayed cleaner on the nut each time I had the sway bar down. Sometimes things are a pain.