that is a great two handed core. i use that for my polearms, and they have turned out great
i know what diameter kitespar to use, i am looking at graphite, because i don't wanna drop $30 on a failed attempt at graphite weapons without knowing that the core i got can be used to build safe weapons.
i've been told that outerdiameter kitespar .606 is all you need for the longest polearm, and my .745 OD are great. but you only need .505 OD for two handers, i have made 5 of those and they are great weapons. you get a little whip, but not much at all, and it will be lighter than .745