You won't believe the number of hours it took to produce this piece that's under a minute long. It still does not show as clear as I'd like, but it gives you the overall concept.
1) Proper length (up to you, but a wingspan is a good sling length)
2) Cut one end as a sharp angle, the other flat. Melt ends with a lighter
3) Cut a nick in the sharp end of the webbing. Split the end of the chopstick, or whittle it to a point.
4) Tie a common overhand knot toward the flat-cut end, one chopstick length from the end.
5) Put the sharp end of the chopstick in the tip of the angle end of the webbing.
6) Using the chopstick'd pointy web, push it into the flat-cut end of the webbing, the full length.
7) Pull out the chopstick.
8) Dress the lengths so the webbing is flat inside the webbing.
9) Work the overhand knot up into the dual web zone, all the way to the entry point (fast-motion part of the video). Don't think...
feel.
10) Dress and tighten up. You are finished.
Make sure you can feel the pointy-end of the webbing exiting the knot (interiorly) at least a few centimeters (an inch or more).
Between the instructions and the video, I believe you are on your way to Beer Knot Nirvana. For a real challenge, try stuffing the one end inside the other without the assistance of the chopstick. It CAN be done, but you'll realize quickly what an advantage the chopstick serves.
3.5 meg. To the dial-up guys, click on the link, go make a sandwich and come right back.
http://treeguy.info/videos/beer_knot.mov