from what I understand if a prop will stay horizontal and you flip it over and it stays horizontal tips are balanced then you move it to a more verticle position and it moves from this point on its own hub is out of balance. now with the prob facing you on balancer if you move the left ear up slightly and it keeps moving up untill close to verticle the top of hub is heavy. if you move left ear up slightly and it moves down back to horizontal then bottom of hub is heavy? prop is not perfectly balanced untill you can release it at any angle and it will stay and not move from that angle when you bump it slightly in any dirrection it should slowly come to a stop and not move backwards from that point and come to rest at a different angle. I have a 27X10 wooden prop after many hours of fine tunning It is perfectly balanced but when I turn it over on my balancer where I am now looking at the backside of prop on the bench it is way off - what would be causing this?

a friend of mine from snap on tools tells me that if a props hub has a heavy spot (10 grams) for example you should take away 5 grams of weight from two equally spaced points apart from this heavy spot rather than to take away 10 grams from that point - can anyone explain this? he claims it is more efficient but cannot explain why.