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Testing Matthias's Marble Pump to see how it would work with a tall column of 5/8" steel bearings.
More videos of interest:
Marble Machine - Ring Gear lift - Re-Edited Original Video
https://youtu.be/bDkEGQi52Js
Making Movement 123 - Reciprocating Rack Mechanism
https://youtu.be/Cas_tOSgz8Y
Gear Head - Working Wood Gear Mechanism
https://youtu.be/C5Ir1zZGiF4
Wood Gear Planetary Drive
https://youtu.be/dhJw_fQJRdc