ORIGINAL: DenverJayhawk
i balance every prop. I'm surprised to see how out of balance these things are. I just have the $3 great planes balancer that has a needle and two conical devices that screw together to hold the prop. You balance it by holding either end of the needle and see which way the prop drops. I've yet to see a prop that was balanced from the manufacturer.
ADD a couple of speaker magnets and a scrap wood frame... worked for me for years.