Jewelry Making Question - I want to learn to tie the knot at the end of a knot & loop choker?

Question:I make leather necklaces, and finish them with cord tips, but I am trying to find the knot & loop design that I have seen on some leather and silk cord necklaces. Any help or web site suggestions would be most appreciated. Thanks!

Answers:
I make a lot of different jewelry and could probably help if you had a picture to show as an example.