Hi, I've recently found The Slingshot Channel and have been obsessively watching videos. There was one in which Joerg demonstrated a simple metal tube or pipe-based slingshot that shot cut-down arrows through the tube. As it happens I have found a piece of copper pipe that I think would work in a similar fashion. Of course, since I found the pipe I can't find that particular video again. What I can't figure out is how the bands were securely attached to the tube. Was the tube actually notched with a groove similar to what would be done with wood? The tube I have is copper (for plumbing), so I don't think it can be notched easily without breaking. I'm open to suggestions on how to attach it securely - not sure just the standard wrap would hold in this configuration. Thanks!