Thank you very much for the information!

I just bought a wood Master Airscrew that needs just a small small small balance. My main concern is the center hole. I have two APC props a guy gave me that the centers are not true. I also have some power points and old TF M series props that none of the holes are centered. I'm still trying prop sizes < do to small wheels and tall grass> once I find a set up I like , I'll need a few props, I thonk I'll gives these a go.

Thanks again. Andy