 A piece of string is inserted through both holes, leaving a length of about 15 to 30 centimeters on each side, and the loop is closed with a knot.Take the ends of the loop at both sides with the fingers, rotate the disk a bit, and draw the rope taut, fast, and release the tension a bit.The disk will spin in one direction, reach its maximum, and then, helped by another yank, start spinning in the opposite direction.