Start both hands on the good edges/rail (my memory may be failing me), right foot on the good edge low down. Throw out to the wide pinch hold, and squeeze! I get my hand in such a position that it cuts the base of my thumb if I try it too often. High left foot onto the goodish foothold (it might not be as good as I remember), and paste the right foot onto a slightly polished, smeary nubbin quite low down. Push off the nubbin really hard, and try to get lots of weight onto the left foothold, and jump off of it. Launch for the top and slap as hard as possible, remembering to suck it all up once you hold it.
PM me your email, and I'll send you a video of my mate doing it.