ah, I think I know what you're asking. In short, we don't have that kind of problem.

However, if you have an engine that has a vibration problem you can sometimes reduce the vibration by installing the prop so that it is vertical with the piston at top-dead-center (TDC). If you use a slightly out of balance prop, you can put the heavy blade down when the piston is up to add more counterbalance to the engine, or put the heavy blade up for less counter balance. I've never seen an engine that needed less counter balance, but one might exist, usually it's the other way around, and a bit extra weight can help smooth out an engine. Of course, a single cylinder engine will always have some RPM ranges where it just vibrates.