My way (Dollys beta) is outside lf on arête, rh on arête. Step up put right heel around arête highish to stop bar door. LH up to guppy arête just above rh. Then bring RH up higher on arête (with sharp pebble iirc) then lean accross the face left, get pebble with LH. Not bring rf onto arête now you're square on the face dead point to the hold.