Aged Sage;
I use a Dremel Tool at 8000 rpm. No counters, no weights no spread sheets, just the feel aquired after years of furling and I'll put mine up against anyones!

I have built furling boards for several members and have taught them the simple way to make an effective furled leader without the use of Spread Sheets, Rpm Counters, etc!

Furling leaders is an art as well as a science. It is really quite easy as several of us have discovered. Methods, materials, tecniques may vary, as in any art form, but they can all produce a Furled Leader that does what it is supposed to do, cast a fly.

Furling leaders is not the Rocket Science some would like us to believe.