Re: Spinner Balancing,
I have access to a lathe, I plan to install the 4 screws and chuck it up by the base plate. Center drill and then drill a 3/16" hole ( for the scale 20MM canon), in the nose . Remove the spinner, and use your prop balancer. Achive proper balance by spinning the spinner, and when it stops, marking the the bottom, (AKA), heavy portion of the spinner. Then drill SMALL holes in the back plate until, when you rotate the spinner, so the holes are 90 degrees from vertical, and release it, the spinner does not move when released. Now do the same thing with the prop, only don't drill holes. Add small amounts of epoxy to the tip opposite the heavy blade. The other option is to rent one of the spin balancers , from Hughes Aerospace, that they use to spin balance satelites. They can balance down to a gnats eyelash. It shouldn't cost more than a new car.
Bob Q.