Lefty Kreh is probably the most well known name in flyfishing today, both for his flycasting as well as his fishing expertise. He has written many books and still conducts flycasting schools even though he is well into his eighties. There are a few variations to this knot floating around, but I usually stick with the original and I have never had one break.
When tying saltwater flies or even wet flies onto their tippet, most fishermen use a uni knot or a blood knot. This results in a fixed connection, and the fly is restricted to moving in the same line as the tippet. This probably works fine, but think of the advantages of having a loop connection to your fly - the fly is free to move and will have a lot more subtle movement during pauses and twitches if it is not fixed to anything. Anyone fishing small minnow lures for bass and bream will always use a loop knot onto the eyelet of the lure for this very reason, and also because the delicate action of the lure can be affected and unbalanced if the fixed knot slips to one side of the eyelet. You may think this is a small detail, but I can guarantee that delicate lures and flies will not swim properly if this happens.
To demonstrate the knot, I used pink mono (for clarity). I also made the loop a bit bigger than I normally would, though this can be something of an advantage if you are fishing for toothy predators such as flathead or tailor, as it provides something like a short double for extra protection.
|1. Form a basic overhand knot in the leader.||2. Take the tag end through the eye of the hook.||3. Move the overhand knot down close to the eye to size your loop.|
|4. Take 3 twists around the main line with the tag end.||5. Feed the tag end through the little triangle between the twists and the overhand knot.||6. Add a little saliva to the knot and gently pull it tight, keeping an eye on the size of your loop.|
|7. The finished loop knot.||8. From the above view, you can see how much more freedom of movement the fly will have with this connection.||9. With practice, you can tie them small enough to use on your small wet flies (especially good on Woolly Buggers)|