You can get a Prop Hub adapter from Scott Baldrige for $15 or so!
Send him an email:
[email protected]
Picture:
http://www.skylites.freeserve.co.uk/...al/mvc-002.htm
Good luck with the engine . . . . my 21cc McCulloch conversion is running GREAT:
http://www.skylites.freeserve.co.uk/engine-video.htm