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It sounds like the thin wires that extend from the sides across the bottom of the seat have come off allowing the springs to slide forward and off the end of the thin steel rod they attach to.
I think there are two thin wires after the spring attachment point. Originally the thin steel rod is wrapped with brown paper with the thin wires wrapped around that on each side. Once the paper breaks down the thin wires can slide forward and off the end of the rod.
With everything in position (springs, rods, and wires) you can do a few additional wraps of wire around thin wire attachment point. A solid core copper wire with the insulation stripped off would work. Then for additional insurance you can apply some epoxy adhesive at the ends of the added wire. That will keep the thin wires in place and prevent them from sliding down and off of the rod.
Back cushions can be repaired or reinforced with heavy cotton fabric and a good adhesive. I rebuild the cushions by reinforcing both the inside where the seat rail has a tendency to tear the foam and the outside where the frame usually exits after tearing the foam.
3M makes a product called Foam Fast 74 that we use for gluing foam to foam at work. It is a contact cement spray product. I don't know that it is any better than the regular contact cement that 3M makes but it worked great at gluing the heavy cotton into the stress areas. I sprayed both surfaces liberally and that allow me to slide the pieces of material into place before the contact cement dried.
Randy
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