I use a crochet hook for that 🙃I believe you stick the tool through the hole in the pouch, stick your latex through the eyelet and then pull the latex through. It just helps getting the bands through the pouch.
I have seen that also, but no one has shown how to use it. Almost all Chinese tubes are tied this way and it holds very well, and you don't need a big jig for a great tube or maybe flat to pouch tie.I found this that I printed out some time ago, don't remember where I found it originally. Hope it helpsView attachment 382556