What is the sound of one piston slapping?
What is the sound of one piston slapping?

I’d never heard of these before tonight, but it’s a neat little machine. Super simple concept and a fun thing to do for just a few bucks of material. I definitely want to build a couple with Jonah this summer.

You can also buy on off amazon for like 10 bucks, but to me building it is half the fun. 

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