I came across the Kong duck while searching for gear; if you havenít seen one itís a tiny ascender that can be used on webbing (including daisy chains!).
The large hole for the carabineer would reduce the friction when youíre pulling and the toothless cam would allow it to be released under load. The clip in point for the crab would also be really short.
It may work fine straight onto a standard daisy (clipping a crab into the loose end of the daisy so it canít slip through the duck). But.. If you could get a custom webbing strap made up (or buy a fish/Yates replacement) you would have a rated full strength adjustable daisy!
This is obviously a bit of big wall theorising so I would be interested to hear opinions before I go out and buy a pair.
(This post was edited by tom_Harding on Mar 17, 2010, 8:32 AM)