Reef Knot（平结）

1.  Keep the green cord as an axis, don't move it. Put the main cord under the axis, we have two parts, left cord and right cord;

2.  Put the left cord on the axis, let the left cord toward to right;

3.  Put the right on the left cord;

4.  Put the right cord under the axis, let the right cord toward left;

 5.  Using the right cord through the left circle. Then tight the cords; The first reef knot has done.

 6.  Put the right cord on the axis;

 7.  Put the left cord on the right cord;

8.  Put the left cord under the axis;

9.  Using the left cord through the right circle. Tight the cords, then the second reef knot has done.

10. Repeat the step 2 to step 9, knotting the cord until the length what you need;

11.  If you just repeat step 2 to step 5, then you can take spiral knot.