Fly Fishing Knots: Arbor Knot Video
The Arbor Knot is used for tying the end of the backing to a fly reel.
How to Tie the Arbor Knot
2. With the tag end, tie a second overhand knot around the standing part of the backing.
3. Pull the second knot tight against the arbor, then pull on the standing part of the line so the knotted tag end snugs up against the first.