Change plastic bands in chair?
You've got to pull the band toward you when you're at the edge of the chair and get some slack where the band goes around the frame. Then use a screwdriver to gently pry the band out of the slot on the frame. If it's an old band there's a chance it will break when you try to pry it out. If you're successful then do the other side. Installing them is just the reverse. Good luck/