Tom, if you check out my blog, you will find a recent entry with pictures, text and even a video of how I attach bands. Just follow the same procedure without the fabric mentioned. In fact, you will find a wealth of technical information in my blog, such as how to design slingshots, and just about every aspect of how bands and elastic works, plus Microsoft Excel spreadsheets to calculate ballistics and ball sizes. I think my blog is pretty much exactly what you're looking for. Note though that everything is subject to debate and these are just my own views and experimental findings. It's like any enthusiast-driven technical hobby. Imagine how many different heat treatment formulas you have seen for something as simple as O1.