:?: I’ve not used it but am going to give it a try.
How short do you trim the tag end of the flyline?
It certainly looks to me that if it is trimmed flush it could “wiggle” loose??? The less flush it is the more it could snag???
In the animated illustration of Castwells knot. Is the loop in the leader a perfection loop?
dock, you are absolutly right,
and, yes it is a perfection knot. 
JC, so you’re saying that it should be clipped as close to flush as possible? Please clarify.
I am starting to use this knot, and I was wondering if I should place a drop of super glue on the tip of my clipped fly line so that water does not get into my fly line. Should I be concerned about this?
Thanks
Hydlide
JC back in 1946 my dad used that knot, and taught me how to tye it dad put a small overhand knot on end of fly line, than made the same knot but put the overhand knot back through the middle. used it for years till i use the no-knot , was hard to get knot down into the eyes. boo rods short leaders three snelled wet fly, good days flyman 3
Dear flyman,
I was hoping it was you when I saw a post from “flyman.”
I don’t know what knot you are talking about, I’d just like to say it’s good to see you posting again. You rebuilt an old Fenwick ultralight rod for me a couple of years ago and you have been kind of scarce since you closed up your shop. I’m glad you are still out and about.
I caught a couple of smallies in the Susky today, and I wondered if you and John F. have been down at all to give it a try yet this year?
Best Wishes,
Avalon 
Hard to get much clearer, "clipped as close to flush as possible? Please clarify. What part of this do you find vague???
and I guess that makes the knot your dad taught you a different knot, right???
I learned this knot as the “sheet bend” from a boy scout’s book on camping back in the 60s. It also was issued with the Orvis rod, reel, and line combos from the 60s.
http://www.iland.net/~jbritton/sheetbend.htm
–Rich
Not…
JC – You are right, after I paid some attention to it. The sheet bend is different. That’s the one I’ve been using all these years.
They are similar but I noticed something when comparing the two in some tests in nylon cord. When you pull tight, the Castwell slips to the side while the sheet bend remains true to the axis of the line.
Ya, kinda like it’s upsidedown, reversed and insideout.
Okay. I’ve looked at the knot page. The Castwell knot will definitely work. I have a leader I have to replace, and I’m going to do it with the Castwell Knot. My question is what kind of loop was used on the end of the flyline? I’d prefer to use the official, certified, tried and true version. (JC - I’m still chuckling over your comment from a few months back about the knot not working, and that since you’re extremely rich you simply have someone tie a new leader on for every cast.) Simply put, though, when you tie it, what kind of loop do you tie on the fly line?
Bill
If you look at the knot, it is the butt of the leader that has the loop. Normally a perfection loop. It is the end of the fly line that is tied to the loop, not the other way around. By the way, I have used this before and it does work. My only draw back is that I may use different leaders with the same line and I have found it some what of a hassel when changing leaders.
Hope this helps. 
AnglerDave - Thanks! I don’t know why I thought it was the other way around, and what you just described actually makes a lot more sense, and will simplify the process. Without the loop, this is a sheet bend, an extremely simple and effective knot. Will I miss the nail knot? Not!
Bill
This is a good knot and yes it reminds me of the sheet bend that I learned along time ago in Boy Scouts. By the way, I do not use any glue when I tie it and I normally trim the tag end very close but not flush. You just have to eye ball it.
Dave
Fishin Bill,
you’ll see by JC’s post above he doesn’t consider it a sheet bend and indeed it is different but similar…well he’s gone so he’ll probably let that go…
And since he is gone I’ll tell you what bit of heresy I did a day or two ago…I think anglerdave is correct… you have to eyeball a little tag…well it seems to me that projects even just a little and must make the tag subject to clipping on the guides or picking up debris…both of which I hate…
so I left the tag even longer and folded it back parrallel along the fly line and superglued the tag to the fly line…very smooth transition…no increase in diameter [even less].
Certainly not something you’d do out fishing…