Absolute genius automatic lubricator
Very few things impress me as much as this did. It has taken a clever idea to the next level of simplicity. I was expecting something similar to the one AvE took apart, but this one is completely different.
I'm not sure if the cells are custom made or if they are standard zinc air cells, but the way they've been used is extraordinary. Do standard zinc air cells liberate gas when discharged slowly without a ready source of oxygen?