Getting the old skins off the seat foam on my 91' and have gotten stuck in that I cannot get the headrest to release. I do not see any release latch which some cars have. Putting a vice grip on the post with a better than 45 deg. angle has allowed me to get what feels like a good amount of longitudinal force when I bang on the vice grip with a hammer, but it is still stuck. The right post is moving freely but this left one is stuck. Any thoughts? Am I missing something?