The Clickspring guy points out that there are no "absolute measurements" in his work. For years now, he's been hand-building an ancient Greek Antikythera Mechanism just to eyeballing it

https://youtu.be/xwmxmUNA7Pw?si=NHFPAaes90hy4ea9

The Antikythera Mechanism Episode 12, Part 2 - Making The Lunar Phase Display "Pipe" and "Cheeks"

YouTube
@bruces I've been watching that build for quite some time. Respectfully, classifying that as "eyeballing it" doesn't give credit to the amount of skill and relative measurement happening there.