I've read up on it and I know you can't perfectly balance a single cylinder but I'm one of those "tinkerers" who like getting into every detail of the build and getting everything perfect.......
Okay, now you're talking a whole new game.
If you really want to get anal, you don't touch the prop at all. You find the heavy blade, then mount it so it's directly opposite the cylinder head when the piston is at top dead center.
That way, the heavy blade helps offset some of the piston weight, thereby allowing for a better balanced engine.
Dennis-