the correct size is a combination of mast tang height and pole length. Tigers for example run the spin bale at 26'8" on a 29'6" mast with a 12' pole. You don't want it at the top of the mast. Block placement will also be critical. I haven't seen a 14 with spin but have seen them with squaretop mains and screechers, F14. Maybe see if you can contact Dan Berger thru the F14 area, he has one.