Twisting fringe on a rag rug

The start of this movie shows two pairs of warp threads separated a bit from each other. Then you see me take about a foot-long piece of the same yarn and set it between the two pairs of warp threads. Pick up the two pairs of warp threads, one in each hand, and tie them in a snug overhand knot around the newly set-in piece of yarn. Now I grasp three threads in each hand and twist both hands to the right, followed by wrapping the two sets of three threads to the left. Repeat this process of twisting the threads to the right and wrapping to the left. When the twisted fringe is long enough, take the two longest ends of the six ends, loop them around the fringe, and pull the two ends through the loop and tighten. I use the white piece of cardboard to measure the correct length for the fringe. The notch in the cardboard shows where the end of the fringe should be secured in order to make all the fringes uniform. The best warp to use for a sturdy rag rug is Bockens 12/6 cotton.