The retention cord starts off at 1cm in width (it's a flat braid) at the end of the pouch.
After 10.5cm it drops a length to 9mm width.
11cm after that it drops another length to 8mm.
After 7cm it drops again to 7mm.
After 6.5cm it drops to 6mm.
After 7.5cm it drops the last cord and is 5mm to the tassle.
As you can tell, I wasn't really measuring anything as I made it, just eyeballed it and got lucky. I think I will have to untie the end and put a proper synthetic cracker because the cotton string just can't handle it. Lots of pretty floating cotton after every crack
For now it's really nice though does have a slight twist to it which I attribute to the cotton string and perhaps my less than stellar braiding.