Tried light... tried some lubricant.... tried cleaning out the threads in the car (a bit of metal did come out).... still nothing. It's really strange, the bolt is approx 1" long. It definitely wants to crossthread at the beginning, but once you get it, it goes pretty easy for the first 3/4", it's just the last 1/4". Any other suggestions? Obviously, an incredibly frusturating experience to get the seat taken apart, put back together, and not be able to get it in the car!!