On teardown there are two rods, one running down each side of the seat underneath the upholstery which pulls the cover down to the seat foam and gives the seat a sculpted, taut appearance. You have to cut the hog rings loose at the bottom of the seat flap to gain access to the rods. Once you locate the rods, cut the hog ring off holding them down and then push down slightly and twist to pull out. You have to do this before sliding the old seat cover up. If it is too difficult on initial teardown you can just cut the upholstery off, reattachment will become quite apparent once you see how it is put together. Not rocket science stuff here and the first time upholstery installer should not feel intimidated by this. You cannot install the new seat cover with the rods in place, you have to go in blind after slipping the new cover over the foam and do it by feel. A tad trying but anyone will be able to do it. This seat was partially re-upholstered over 20 years ago and I used nylon ties to re-attach. They outlasted the upholstery and are a heap easier to remove than those dang metal hog rings.