The method we used for balancing was as follows;
1) we made an insert for the center hole of the prop, the same thickness as the prop at its hub.
2) the insert had a center hole sized for a piece of mono fishing line.
3) the fishing line was inserted through the insert and knotted on the lower side.
4) the prop was suspended by the fishing line.
5) a truly balanced prop would sit horizontally
A zig zag paper would tilt the prop if placed on either side of the prop, or at the leading edge or trailing edge. It was a very accurate scale which we used to sell to ultralight pilots so they could balance their own props.
I will save BS stories for campfires, rather than something as interesting and important as wind turbines.
Cheers.
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