…it's a lockwasher system!

(Srsly, this looks nifty.)

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

You ain't wrong, Dan. I've seen those exactly once, on a European machine when I was still in the workforce. REALLY interesting, and they do work. Only downfall I saw was dis-assembly of highly torqued fasteners. It's a cast-iron beeaaatch to get them apart. Wouldn't want to use them in a situation where something needs to be inspected regularly.

Roger

OP was deleted. Any hints?

From some of the comments it sounds like nord-locks maybe?

Weird, the Reddit post still shows up for me. Oh well, wtvr. Yup, Nord Lock. Here is the video that was in the Reddit post.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.