Pumpjack goes round and round and up and down

LEGO is made from plastic. Plastic is made from oil. And Gilcelio Chagas is extracting oil with this neat pumpjack. A pumpjack is essentially a device to convert rotational motion to pumping motion to suck oil out of a well. As Gilcelio illustrates very nicely in his video of the pumpjack at work. I lied about the oil bit, you need to go underground for that.

Pumpjack (See in operation )