Elastic is broken in map holder on back of driver's seat. I think I could fix it if I could get the plastic seatback off. Clips at the top of the seatback (visible by pulling the top of the seatback out) will release if the seatback slides up. This makes me think if I yank the bottom of the seat back out, I can then slide it up and off. But I don't want to break anything or buy a new seat. Any ideas?