Furling, other thoughts
Looks like I tarried too long and lost the other thread, so I'll start another.
For the person who wondered what the spey formula might be, this is just the one I've used a few times. I'm told it works well, through I'm not a spey caster.
I use a 12' board to make a 10' 9" leader. The thread taper is 34-28-22-18-14. This translates to three loops in each leg of 17 threads, then 11, then 7. I use 6/0 thread.
Hope this helps.
(Snow Day today, but the school year is extended to June 16th now. Still, the pups found a dropped moose antler out front, well worth it)