A couple of things about balancing. First, be smart as most of the posters are encouraging. Here is a post on another site that uses an interesting method that seems to work well -> [link=http://www.flyingcirkus.com/forum/forum_posts.asp?TID=400&KW=balance]balance[/link] Haven't tried it on smaller props, but is fine for the larger ones.
I also paint the light blade with clear or whatever to bring it into balance the best I can. It also does no harm whatsoever to cut the longer blade a little, a little, to bring it into balance. Some of the old timers will remember the 1/2A speed engines with one blade props. Sort of the same principle. On larger single cylinder engines this may get dicey, but again, I am running larger twins.
Have a nice day_bob