mmmm, I don't know... I'm getting the feeling that you maybe kinda coulda do this but that's not the primary purpose of using two small split rings instead of one larger one, or plastic D-rings, etc..
I'd still like to hear from Paul what the initial justification was for choosing this system. he has already said that using one by itself is not strong enough, and as it is, I can't get my Metolius carabiners through them.
edit: OK I tried this using 3 different cords - 1.8mm Triptease, 1.75mm Zing-it, and 3mm Bluewater cord - and none of them worked very well. all of them required fiddling with and then a slippery half-hitch behind it, and even then, it looked very unreliable. I would call this unsatisfactory, only relied on as an last ditch emergency measure, maybe a gimmick...
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