Would like to start furling 6/0 uni-thread to make 3-4 wt 7 foot leaders...any formulas out there?

Like the ones I get from Streamside but I have wrecked enough at 5.00 a crack that it's time.

I am confident I can build the jig and get the process, just not sure of a recipe for this size and weaight...8 foot would be OK as well.

Sorry, no funds to buy the DVD at this time.