Building furled leaders

I dont use furled leaders but I know several people who do and have no complaints,so this winter I'm going to make several of these to test them for next spring. My only concern with using this method that even after twisting the 15lb mono to approx 30lb and then twisting it again to make an approx 60lb top part to the leader,your still left with a 15lb loop where your tippet attaches.If like all pike fly fisherman that use some kind of wire trace of around 25lb's to 30lb then surely the weak point would be the 15lb mono loop. Any thoughts on this or if any of you use this method then drop me a comment or two.

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