Two comments on the post 1) 'The ring should open at the corners' I assume she means you have the clip the ring at the corner in order to make a turn. 2) Be sure that your ring, as she calls it, starts at the same place on the top and the bottom. If the seam is in the center of one side, be sure it's exactly in the center on the other. And for good measure, if you're using older foam, a wrap of polyester batting around the foam refreshes the look.