Capt. Mel's Tube Knot
A Fly Line to Butt Section Connection
About 5 years ago after seeing so many really bad knots connecting the fly line to the butt leader section, I came up with a knot that did not break, was a permanent part of the fly line and will easily go through the guides if necessary. I don't use anything under a 6 weight but I don't see why it won't work for all line sizes. It is not an easy knot to tie but when I'm pulling on a tarpon that's over 150 pounds I can feel secure that at least that knot wont break or come apart. I hope you can understand the step by step process of how to tie this knot from the following pictures and my explanations. I used a 13 weight fly line and 50 pound mono for the butt section.
- I use a tube, one as small as possible but will still allow the butt material and the stripped fly line to fit into it at the same time. You may prefer a different method of making a nail knot with some other devise and that will still accommodate both the mono and the stripped fly line back through the nail knot.
- To strip the coating from the fly line I used a girth hitch and 20 pound Hard Mason leader material.
- Pull the girth hitch up very tight onto the fly line before stripping off 5 '' of the coating. (Yes you lose 5 inches of the fly line but only once.)
- Here the coating has been stripped off the fly line, I painted it orange so you can see it in the knot.
- Tie a 6 turn nail knot, using the the tag end of the 50 pound mono, around the tube, the fly line and the butt section at the point of where the coating ends. This is a very important point because if you leave any of the coated part of the line beyond the knot it won't pull up tight and will be too bulky. If you allow the stripped part to be inside the knot you may have hinging between the butt section and the fly line.
- Once the nail knot is snug around the tube, take 3 turns of the stripped off fly line and wrap it around the butt leader and stick it into the tube.
- Remove the tube and very carefully pull the nail knot semi tight, (remember to make sure it stays on the coated part of the fly line!)
- At this point you will need some pliers to pull and jam the stripped line up against the nail knot.
- With the nail clippers trim the loose ends of the mono and the stripped end as close as possible.
- You may use glue to secure the knot but it's really not necessary.
Please, if you have any questions or thoughts about this knot or suggestions on ways that I can do a better job of explaining the tying of it let me know!