Take that difference in ounces, grab the prop by the tips and apply that force in rapid alternating mode. Large props will generate a lot of torque this way. See what happens?
Does that look to you as balance? No way! The unbalance in a single cylinder engine is bad enough, without us adding to it.
Do not believe all that is written. A lot of it is plain ..., not worth the paper it is written on, or the bandwidth it spoils.
A good example is the single blade speed prop. It takes som very fancy shaping of the counterbalance mass, to get all oscillating torques balanced out for that record run, when everything must be just right.