Mastro Subaru just installed a new seatback. When they were done they showed me the old one. Just like tornado said. Top two hooks had worn through the paper. The seatframe has fiber insulation on the middle two points of the seatback, but the top and bottom are just metal on metal separated by paper. The awesome tech over at Mastro actually took the extra time and made little foam rubber pieces to go under all six attatchment points for the spring. The old spring was also bent on one corner it looked like. The seat now feels and sounds right again. For anyone wanting to avoid waiting on a dealer or soa- Tornado has it nailed. Thanks for an excellent thread and for spending the time to show folks the fix for what I'm sure will be a common annoyance. Although I didn't do it myself- thanks anyhow.