Tom Lutyens showed this at the fall 88Tactical bushcraft meet. I had never seen it before and thought it was cool. He said he learned it from locals in the Phillipines. It goes like this: If you have a length of 550 paracord, but it's too short for your needs, you can almost double it's length. This one is a yard long. You simply pull the core threads out, but not all the way. Leave about 3-4 inches still inside, then tie an overhand knot where they are still overlapped inside. That leaves you with almost twice as much cordage. Thanks Tom.