Keep cutting the nasty, old, rat-pee-smelling burlap off the springs. Now's the time to inspect the seat base for any broken springs. If you find any, it's a big bummer. Pro upholstery guys can buy a roll of spring material and work it into the seat to save it, but you probably shouldn't try it yourself. An easier option may be OPG's application-specific seat-support-spring kits. Luckily, our stuff was good. Now it's clean-up and spray paint time, if you feel like it.