If you're prototyping things out of thick, flexible materials, this handy little tool might help. The Speedy Stitcher Sewing Awl can be used to sew leather, webbing, canvas tarps, shoes, belts and other problematically-thick materials. It's also small enough to bring with you on a camping trip, allowing you to fix gear on the fly. Here's how you use the thing:I've never tried one myself, but it seems useful. They run about $15 on Amazon.