In reply to PJoutdoors:
I seem to remember being glad of 60s as the anchor is a bit back from the edge. You might be OK on a single since there's gear in either crack most of the way up so you don't have to change which one you're in very often.
Alternatively presumably you're abbing in on a separate rope? If you ab directly down the line, which I think most people do, then you could belay on that.
Enjoy, it's an absolutely brilliant route!