Hi!
Balancing propellers is easy.
You just sand the front side ( the curved side) of the propeller! That's it!
Use fine sandpaper 180-240.
Don't be afraid of doing this as it is so very easy to do. If you sand a wooden prop I would recommend to finally putting on Ca glue (thin variety) on it, spread out thin by using a finger(real messy), then sanding and polishing to a bright mirror shine. I do this with both my carbon and with my wooden propellers.
Plastic props (like APC) I only sand.
Never ever add any weights to your propeller or put on any plastic covering film like when covering heli blades. And do not balance a propeller by cutting the tip on just one side...that's dead penalty on doing this....
And don't be afraid to modify propellers by altering the the shape of the blade(s) and thinning the blades.
That way you learn more about how to get more performance from the prop. (you also learn what not to do).
But always be careful what you do, A spinning prop is mighty powerful and could do much harm to ones body.

Regards!
Jan K
Sweden


Regards!

JanK