I don’t know because I never dismantle the machine. But basically there are 3 movements :
- up and down into the jar and inside the jar, in water, out of water to expel water, and exiting the jar
- rotate/spin left and right only into the jar
- switching jars
'+ reset to start pushing the arm above the first left jar made by hand, seeming to load a spring to switch jars from left to right.
There must be a kind of clutch to start/stop spinning if there is only one motor.