WOW!!! This knot appears to be the holy grail of tarp positioning, it allows me to tie it off center as far as length is concerned, adjust it to the perfect line length on either side of the Maccat Dring backwards or forwards while maintaining a hold. Using this in with the bowline +lark head combo on the dring allows me to setup the tarp ridge tie outs in less than a minute.
Just one question, if anyone also uses this know, should i Wrap around the tree before i tie the ray mears adjustable knot, if i do not it is just looped around the tree not WRAPPED around out, the knot functions both ways. If I wrap it i keep a stick stuck behind the wrapped part so i can pull it out easy if i have to adjust beyond the length of available line. EUREKA!