My leaders are velcroed to the poles, made of striped ticking and have a canvas leader atached to them (picture below). I pin the backing to the canvas part, this makes it easy to remove/replace the top if needed. The center is marked on both leaders. I roll the backing and float both the batting and top. It makes for lots less pinning/rolling and is easy to keep everything straight and centered with each advance. My setup is a Tin Lizzie.