The seat back was much the same as the base, these are the head rest tubes that's slot in the frame, couldn't get the pigs out. I had a spare frame that I was able to see the fixings, I had to put a pair of pliers inside the seat base and squeeze the ends of the tubes together so the barb would slide up out of the seat.
Much the same for the tilt lever surround, it has a sort of barb that I had to try and press in so it came out of the frame without breaking it.
And the back with the foam and cover removed, more or less the same as the base.
