Bam,
I chase pike and muskies on the fly. With the supple, knotable, braided wire available today...e.g. Tygerwire or American brand,try this... It's never failed me.
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The knot!
It's called a Jig Loop. Tie an overhand knot about 2-3" from the end of the wire tippet BUT don't pull it totally shut. Leave it "just loose enough" to insert the end of this wire back into. Now put the tag end into the hook eye.
Now push this tag end through that overhand knot...that you left loose "enough" but not too loose, right?
Now, take and make a 1/2 hitch just behind that overhand knot and snug it up. and make a second 1/2 hitch again behind this one but this time puller her tight with a pair of pliers!
Done! If it turned out right..and sometimes it doesn't, depending on how tight that overhand knot was...you'll end up with a neat little "jig loop" that your fly can swing freely on!!!
If it didn't turn out just perfect don't sweat it. Fish it anyhow. And I find it best to try to tie a few of these in the plain cheap mono before I go fishing...for a test!
Really, it's simple.
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It's not a knot that "draws up nicely" but rather allows the fly freedom to move.
Jeremy.