Here is the single figure 8 knot:
1. One cord with two-way, keep the right cord as an axis, don't move it.
2. Put the left cord on the right one, make a clockwise circle; Then, put the left cord under the right one, make an anticlockwise circle.
4. Adjust the cord, then done.
1. One cord with two-way, keep the right cord as an axis, don't move it. Put the left cord on the right one, make a clockwise circle;
2. Move the cord under the right one, through the first clockwise circle, make sure the cord is on the left one.
3. Move the cord under the left one, through the first clockwise circle, make sure the cord is on the right one.
4. Repeat step 3 and step 4;
5. Knot the cord until the length what you need, then tight the cord and adjust it.