This should stir up a lot of flak. There is an article out recently about not balbncing props at all. The ony part recomended is to put the heavier blade up when the engine is at TDC. I thought this was a bunch of hooey until I looked further into the argument. Single cylinder engines are impossible to balance internally. A counterweight on the shaft won't even do the job, although it does help some. The man who wrote the article is, and has been for sometime, profoundly deaf and tunes his engines by feeling the vibrations. His engines are some of the smoothest running at his field. Take it for what it's worth.