How about this? I came across some professional fletcher's page that said he used nylon upholstery thread. I got some last night and it is a tiny bit thick but very, very strong. I'm doing a batch of 30 arrows right now so to save time I fletched with super glue (hold 30 seconds and repeat) and I'm wrapping my feathers with this nylon thread. A drop of super glue spread around with the finger at the front and back keeps the thread from unwinding.
I fletched 18 arrows with a Jo-Jan mono fletcher while watching V For Vendeta. Since I'm wrapping the feathers anyway, I like this super glue trick. I would like to go on the record for recommending super glue, nylon thread, and V For Vendeta.
J. D. Duff