I went a step further, based on some older posts, and added a thin layer of carpet between the springs and the burlap. I bought some carpet runner from the home store. It is rubber or vinyl baked. I put that rubber layer facing the springs, in the hopes of isolating the springs from my backside, and used the hog rings to secure the carpet runner to the frame. Then I added the burlap, cotton batting and outside layer. I used the reproduction clips instead of the hog rings, as I didn't want to tear the new upholstery fabric. Included are pics of each layer, finished cushion and installed in truck, prior to removal and deconstruction of my basketcase.... I intentionally did not use regular carpet as the glue on the back of regular carpet gets dried and brittle and flakes off under the seat. My hope is that the rubber backing will provide the isolation that I'm after without the dried bits of glue falling under the seat. Hope this helps.
