this is what I came up with from my reserch. It is by no means perfict but my hope is to clarify some things for you.
2 Stainless steel, or brass buckles
70' of 8 ply mohair cording. (for a 19 strand cinch)
2 ply mohair cord (langth depends on decoration)
A flat serface
patence, and time
Step 1: Starting
Step 2: Tight
make sure you have exra (about 2') for finishing off on either side.
Step 3: Finishing Ends
You have to start with the bottom outside cord that is beside the excess we resurved first, or the first one if you don't have two bars. if your outside cord is on top of the excess flip it over.
take the excess and go up and around the bottom out side cord, pull downward and repeat, go all the way across and revere going the other way.
for detailed instructions for this and other methods have a look here!
Step 4: Decoration
use 2 ply cord for this part.
you start with a X on one end of the Cinch.
next go over and under alternating strands each time.
here is Pop Wagner explaning this step is detail.
I find it helpful to bundle the ends that i'm working with,
the main thing to keep in mind is thightness, you don't want anything loose.