Hand scraping

In order to do precise machining, you need machine tools with precise surfaces. Which, unless you believe god hands down grade A surface plates as well as commandments, raises the question of how you get a precise surface to begin with. I spent the weekend at a class learning some of the basic techniques, thanks to a wonderful birthday present from corivax

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Why does all hold music have repeating sections of static? Surely they aren't all using analog tape still...