oh. also, I have old fly line. could i cut a 15 inch strip of that as well? I used to have the Bass Pro White River orange fly line and replaced it with WF6F Mastery Trout line.. could i use the old fly line and nail knot it to the new fly line and put a loop on it? or 12 lb mono? 17 lb mono? 30 lb mono or even 80 lb powerpro braid. those are my sizes of other line I have. I'm curious on what size diameter 5x Fly line is at the butt end of it