Andy,


I know Bolly wood props are balanced after the machining and varnishing processes are completed.

The balancer finds the exact C/G of the ready prop and drills the hole there.
It happens that due to density differences in the wood, the hole may come out a bit off-center in the hub.

It is not that it will be 1/4" from one side and 3/4" from the other... If that happens I am sure the prop will be scrapped.
But if you measure with a pair of vernier calipers, the hole may be up to 1 mm closer to one side than to the other, and/or one blade may be up to 1 mm longer than the other.

Such differences cannot be seen in flight quality, but I am sure blade tracking must be true.

Since the prop is spun by the engine around its C/G, it will stay that way.