I am making a 5yr a sling shot and wanted to see if anyone knew of a great band/strap/tube that would work best. He is not a huge big kid so I was thinking something he can pull back and have fun with. I dont want to buy a pre-made band from a department store as those seem to be a little tough for a small kid to pull back. If you know of a band/tube/strap that would work please let me know. Thanks for your help in advance.