Berkely Fishing is another source for the sleeves.
I carry Den-Tek dental floss threaders everywhere for easily pulling large stuff through small holes. They come in a snap plastic case for easy storing in the toolbox. You can find them at pharmacy stores.
Try Stretch Magic for the topping lift. The material tends not to get tired like bungee. Can find it at fabric stores or in bead stringing sections at other stores. Get the 1mm size and use a sleeve crimp for the loops.