I neglected to add that balancing equipment is not needed. Believe it or not, just pressing your index finger tip, hard, against a surface will register vibration.
While I am experienced balancing all sorts of things, the "finger test" is valid and quite accurate.
For example of the 10 shaft bearings, how do I know which one is vibrating? I can put my hand on each and they feel the same. But, push my finger tip on the bearing, and vibrations are directly transmitted into the bones and nerves. Within seconds, it's obvious which one is bad.
As crazy as it sounds, I can balance a lister this way.
Too much vertical vibes = not enough counterweight.
Too much horizontal vibes = too much counterweight.
Another thing. The weight is always opposed to the crank pin. Plus or minus a few degrees adjustment for other imbalances.