There's an thin right hand sidepull on the right side of the arete, but i can't remember whether i used it to get the pocket or as an intermediate after, but anyway, with left hand in the pocket, I guppied the base of the top arete with my right, chucked a sketchy left heel up beneath the pocket, an locked to the high boss/ end of the break, which wasn't as friendly as i'd hoped, matched this and finished by rocking up the left side.