I have both a Hobie 14 and a Prindle 18. When it's too windy (blowing 25+)for the Prindle main, I have used the Hobie 14 main on the Prindle 18. Most cats secure the top of the main to the mast via a hook on the masthead and a ring on the halyard. I don't know how the G cat does it, but when I put the Hobie 14 main on the Prindle mast, of course it's aobut 3 feet short of reaching the top. Luckily the Prindle mast also has a horn clete down at the base of the mast, so I just tie off the halyard there when I'm using the H14 main.