In 'Fly Fishing For Beginners'
we cover a few of the basic knots used in flyfishing.
The Nail Knot is probably one of the strongest connecting
knots and is used to connect the fly line to the backing,
which in turn connects with the reel.
The above clip is an excerpt
from the audiobook
(with added illustrations taken from the ebook version).
The full audiobook is 1 hour and
43 minutes long.