In reply to popebenedictus: There's a sideways nut 3 in a narrow slot 'round the left-hand side of the flutings - just stick it in horizontally and twist through 90 degrees, like a key in a keyhole, bomber! I've always thought that a runnner in Fluted Crack (the one on the left) is a bit of a cheat. Don't think i'd like to use slings over the top of the flutings unless they were well-weighed down!