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Re:Ask HN: What problem are you close to solving and how can... by minhmeoke on Sunday August 29, 2021 @07:44PM (#28351528)
One more idea, there exist worm drive micrometers which allow you to step down the linear movement per revolution even more:

https://www.global-optosigma.com/en_jp/Catalogs/pno/?from=pa...

If you have machining/fabrication skills, it might also be possible to buy a few worm gear sets and modify your micrometer to move really slowly but precisely.

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