that not the knot i'm thinking of....
anyway, i think that this might be it. the knot used on the white strings, he calls it a chain knot too.
http://www.slinging.org/forum2/yabb/YaBB.cgi?board=1;action=display;num=11005923...anyway, i used this knot to shorten my sling, and using a method i can describe with words, i used my toggle, to keep it from coming undone, meaning no knots to untie. I'm wearing it right now about my head. let's see how long it takes to undo...
fifteen seconds! that includes taking it off and trying to figure out how i made it stay so perfectly. i think that with a bit of practice it would be about three seconds max. just pull the loop off of the toggle, and tug.
quite awesome. i should note that i'm using paracord. this method wouldn't work so well witha thicker sling. and i'd never do it to a nice sling braided from alpaca fiber/wool, that sort of thing, though i suppose you could.
the 'chain knot' makes it look kind of cool too. if it were split pouch, you'd never guess it was a sling. ok well maybe we would, but definitely not anyone else.
btw, my sling is ~70" end to end. this would be even easier with a shorter sling.
i'll get pics up apprx thirty hours from this post, then this will make some sense.