Anyone have any tricks/ideas for unsticking the passengers seat? I moved the seat up yesterday to get a jump start. Now it  won't go back again. The left side seems to be the side that is caught up somehow, while the right side of the seat track feels free to slide. This makes think that there's some sort of pin or something that is not moving in the left side of the track. We took the seat off and couldn't find any immediately oblivious issues. It's an '85 vanagon. Non swivel front passenger seat.