hey gree,
my copy of "catamaran racing for the 90's finally turned up", (ordered 2nd hand from the usa, delivered new from germany???)

and i've been catching up on how mast pre-bend allows a powerful downhaul system to control the sail shape in a way that was not possible with the older straight spreader masts

now since your and my old 5.2 masts have straight spreaders it seems we shouldn't spend as much time on downhaul control as people with swept spreader masts

you mentioned earlier that you didn't really want to start using airborne's newer 5.2 mast as it would mean drilling out all the new stainless rivets you used to install your new downhaul system to your old mast

BUT if the newer mast has swept spreaders maybe you'd better get drilling so you can control that new squaretop...