Yeah, I’ll check that out… I was thinking that primitive builder guy would do well going to the past but I wasn’t sure how much he could teach people, so it’s cool to hear about a someone doing higher tech from scratch.

Also, that ancient puzzle box/lunar calendar/whatever it was is a counter example showing that some artisans were capable of precision work. The industrial revolution might have been more about scaling precision work to mass production levels. Like adopting standard units of measurement was a big part of it, which isn’t really technology but just getting everyone on the same page. Before that, a foot could have a different length depending on where you were, if that region even had a reliable and reproducible definition for what a foot was exactly.