Tying Methods
One can easily make a loop using a double figure eight knot by doubling the rope, then tying the standard figure-of-eight knot. If the loop has to be made around a post or through a ring, and only one end of the rope is available, the follow-through (also known as the re-threaded) method is used by tying a loose figure eight knot in the rope, then putting the working end around the object. The working end is retraced through the original figure eight knot to form a double figure eight.
The follow-through method is used when the knot must be tied around an object that cannot easily have a loop slipped over it. In particular, it is used to attach a rope to a climbing harness. The double bowline accomplishes the same task, can be tied faster, and does not jam. However, the double bowline may untie during long climbs if not properly backed up, so most climbers prefer the figure eight follow-through. A figure eight follow-through will not come untied, is easy to teach. However, the knot might come handy even wrongly or partially tied. It is necessary to carefully verify that it has been tied correctly. The knot is commonly backed up by tying a strangle knot or an overhand knot around the standing end.
Read more about this topic: Figure-eight Loop
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