Oh is that what they are? I did HVAC for a few months when the enviro field was slow. Saw them and thought they were the damnedest things.

I asked a 797F haul truck driver that once lol.

Have you seen those little cardboard jig saws that are safe for kids? They’re like a little table saw set up but instead of spinning the ‘blade’ moves up and down.

If you guys make a lot of stuff like this together, you should consider one. They look fun.

I just checked and they are pricey - maybe you can find a knock off or a second hand one.