Take a square of cardboard and cut off the corners to make an octagon. I used the top of a pizza take out box and made a 4" square (size of square is not critical). Cut a 3/4" (again not ctitical) slit on center of each sine of the octagon. Cut a hole in center of square. Take 7 strands of cord and tie overhand knot in one end.
Push overhand knot in center of hole and put one strand each in seven slits leaving the empty slit in the East (3 o'clock) position. Clip a light weight (bulldog clip) to the knot.
I find it easier to move the disk in a counter-clockwise direction but you can move the disk clockwiase as long as you are consistant. Count over
3 positions clockwise and take the cord there (red cord, south-west position) and move it up to the empty slot. shift the disk counter-clockwise so the empty slot is in the East (3 o'clock) position.
That is all there to it. Count over three clockwise, move the cord there to the empty slot, and turn the disk so the empty slot is at the East.
Will bring us to here. When the white cord is moved to the empty slot the cords will once again be in the be starting order.
Continue in this manner until finished. Tie end in overhand knot.
You will get an unholy mess on your hands if you don't straiaghten out the cords from time to time
When you use 2 colors you can see the spiral pattern appear