Here is a solution I developed using parachute cord and a spring loaded two hole cord stop. The tippet/leader feeds through one of the holes. The advantage of using non elastic material is that none of it handles water and dampness well, and it stretches out. Once your material is low, the elastic becomes loose. The disadvantage of this system, and one reason I haven't refined it for production, is that every time you pull some tippet you have to tighten up the cord around the spool. It's an extra step that I've found to be annoying. It's also time consuming, although it doesn't look like it. It's hard to feed the cord through the cord stopper and get the knots flattened down. I do use them, but I think there are better solutions. I'm working on one now with much better elastic. The solution in the video is good, but I think the opening in the tubing is too wide. Once that elastic loosens or the material gets low it will be pretty sloppy. Other Fails: Gluing elastic and using a grommet like you see on the SA spools. It too is time consuming and regardless of what glue you choose, it WILL fail sooner than later. That's why the factory tenders are stitched with a box stitch. Honestly, I obsessed over these earlier this year, as I know there's a better aftermarket solution, especially for larger leader spools that don't come with much of anything. I brought in a lot of parts to mess with it, and have to come up with something that I think is truly an improvement. Working on it….