Gave up on furled leaders , I made some successfully after watching a you tube demonstration, made some out of polypropylene, which I found were too limp, and some out of some 1lb BS mono that worked fairly well , but it was too complicated, I now use 10lb mono to my cast and taper the cast to a 4lb point so I have 3ft of 10lb, to 2ft -6in of 8lb, to 3ft of 6lb to 3ft of 4lb, this is for a 3 dropper cast,
it works for me, I don't use braided loops sticking to the old figure "8" knot, for a quick change of casts, but then I,m a bit of a luddite,
I generally only use intermediate lines , on my 5wt rod, I bought the blanks from here , easgach 1