Hi everyone, Fews days ago I discovered that if you put one "arm" of that type of pliers: http://www.peche-et-leurre-discount.fr/1073-1250-thickbox/pince-ronde-pezon-michel.jpg IN a tube (thera tube black here) and you push a little bit on the tube, then you have a completely fixed tube. It's very hard to undo. I had to cut the tube. So, if you use a metal cone like this and turn it a litte bit rough with a file, you can get a very cool fixation for every slingshot or laucher. Now you just need to drill a conic hole (or regular hole) in the piece you want to fix the tube. Something like this: It will be very solid for sure and very clean. I have no time to experiment this because of studies. But I'm pretty sure that it can ben a cool way to fix some tubes!