It weighs too much for me to pick up, maybe 50-75 lbs (well made, 70’s era?). The original plastic/vinyl 1/4” is not coming loose. How can I add a new seating surface that will last long term? It has a metal bar that is right beneath the hip area and it must not stretch much because of the bar. Any ideas? Wood, webbing, whatever. I am open to ideas. Forgive lawn mess in photo, still too wet to mow here.... (* I am not sure why it looks curved in the knee area photo, but it is not.) Husband loves it, so I want to fix it.