Seat repair

[CaptiV8ted]

Hi all, I'm trying to remove the upper shell / back of an early Cerbera front seat (non Tuscan type). I found a post on here which said remove the 2x screws in the lower seat back and 2x screws adjacent to the head rest. Having done this, it still feels as though something is holding it on. Is there an internal clip or something stopping it from raising up?

Thanks.