Join Date: May 2002
Location: GGACC to the Aleutians
The Duncan Loop is an excellent knot.
It is easy to tie, is secure, and the size of loop can be easily adjusted. The loop will slip to the eye when you hook a fish; merely slide the knot back to the loop size you desire.
An interesting aside re the nail knot and the Duncan Loop, also known as the Uni-Knot comes from the number one knot person in the world, IMHO, an Australian named Geoff Wilson. Wilson has published a number of books [Amatobooks.com] on knots and proves with diagrams that the nail knot and Duncan Loop are identical. Wilson rates the Duncan Loop as an excellent knot.
For the knot enthusiasts on this board, take a piece of small diameter [1/8" -- 3mm] cord and tie a dozen Duncan Loops and a dozen nail knots and you'll prove to yourself the knots are identical.