A member asked if I would post this... so here ya go. This is the same process I use for my Zing It prusiks, although the measurements are a bit shorter.
is your splicing tool just a wire coat hanger? i saved like 25 of those because they come in handy for so many things.
I was following this thread and making my own continuous loops. My DIY fid is a guitar string. I started thick, thinking a low E would be good--that was a mistake. A "G" or perhaps a "B" from a heavy set functions best. Stiffest, but still thin. For non-guitarists, you could use any string, but the high "E" starts to get too thin to be useful. "Unwound" means a plain wire, not one that's wound with bronze in a helical fashion.
I suppose you could improve on the design with a dowel handle covered in shrink tubing... but my guitar string, doubled, rolls up nice in the Amsteel bag, ready to use.
I made one wrong...didn't lock it the way you are and the bury pulled out. Now i get it!
Technically, its not a lock.... But it does prevent the tails from easily being pulled out.
EDIT: Need to learn how to spell.
I was that member, thanks. Excellent work, again!