
I saw this trick several years ago at a Fly Tying Expo in Eugene, Oregon (Albany, Oregon now; March). A common problem with trailing tails of marabou or rabbit strips is that the tail gets wrapped around the bend of the hook and does not trail behind the fly. The concept of the mono loop is that it supports the rabbit fur strip out away from the bend of the hook, thereby lessening the sag of the tail and possibility of it catching around the bend. This is a technique I have not used. I would think it is better suited for straight cut rabbit fur and not marabou.
“A mono loop must be tyed at the back of the hook to prevent the tail from fouling around the hook. It must be a stiff mono with a break strength of 20#-40#. Mason is perfect for this. Use a pair of pliers to mash the ends of the mono flat for better strength at the tye in point. Form a loop extending ½” behind the hook right on top. Tye the tail in right on top of the mono loop. Glue that stage down to the hook with Crazy Glue (brushable) so it won’t twist around the hook.” Mangrove Coast Fly Fishers
Simon Graham commented: “I use this method a lot,especially when using Raccoon fur strips on my poppers. I use weed trimmer cord on mine though, here’s what I do http://pikeflyfishingarticles.blogspot.com/2009/11/tail-loop-guards.html”

I use this method a lot,especially when using Raccoon fur strips on my poppers. I use weed trimmer cord on mine though, here’s what I do http://pikeflyfishingarticles.blogspot.com/2009/11/tail-loop-guards.html
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