was playing round today, dont know if anyone does this but i haven't heard it mentioned before. Only tried this out low level, seemed safe enough though. I attached the midline to the distel/pulley krab with a clove hitch. If anyone can suggest a better knot/krab combo would be appreciated. Although it worked fine it didn't quite sit right. anyway it advances well, just like using a lock jack, and once you make a descent it easily unclips to be put back in a split tail.