RE: Hangar 9 33% Edge 540
I'm using the Red 4" CBA Spinner from [link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXA427]Tower Hobbies[/link] along with the Actro-Hub [link=http://www.hobby-lobby.com/actro-mount.htm]ACT266[/link] adaptor from Hobby Lobby.
The CBA Spinner adapter is very close to the 8mm threaded Actro prop shaft so a little touch-up with an 8mm tap was all that was needed for a great fit.