I use a perfection loop in all of my lines for a loop to loop connection with my furled thread leaders and on the tippet for a loop to loop connection there. The knot is strong but I also add a drop of super glue to the fly line knot just to be safe. Since the fly line is always at least a few inches beyond the tiptop, the knot does not interfere with shooting the line. I tie it by making a figure 8 then wrapping the tag behind the upper loop and then in front of it and then pull the lower loop over the tag and through the upper loop.