The easiest and fastest way to handle, count and load balls is with a piece of steel or copper tubing with an ID slightly larger than the balls. To count X balls, you measure X diameters, and dimple the tube, or drill across and set a stop pin. Finish by bending the tube into a scoop shape, and stick the far end into a file or screwdriver handle.
Then store your balls in a long tray.
To use - run the tool up the tray of balls and it'll fill with an exact count. Set up the hub, with the axle blocking the hole, and pour out of the tube and you're done. Total cost to make is about a buck or two.
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