So my Jobo was dead, dead, dead. Except for the motor and the power transformer, and the hull with moving parts. Next I cross-connected the outside taps in order to reverse the polarity to the motor merely by opening and closing the microswitch. I later made it look neater by securing the wires. The next step was to optimize use of chemicals.
Sizes are important to roll volume.
I use soda or water bottles for bigger air-tight sizes.