So I have two sets of bands I can use, Theratube red or blue flat surgical bands. I'm aware of how Theratube red would perform, but I don't know how the surgical bands would. I'll be using a single strand per fork with the Theratube and double layering the surgical bands. As for the forks, I would like to make one from a natural and another from pencils and duct tape as seen in Joerg's "Weaponizing Duct Tape" vid. With these ideas, I would like to know which ones I should pair up to make a sling shot. Any suggestions?