The Farrimond Hitch is a very useful knot and is similar to the Prusik Knot. It uses friction to stay in place on a line when tension is added. When it is tied with a slippery quick release it can be untied from around a tree or when it is used as a structural ridgeline on the hammock to support the bugnet. All R&R hammocks come completely rigged when you get it, but it is always great to know how to re-string your structural ridgeline after you have washed your hammock after an extended hang.