Some flat washers are flatter than others (amateur metrology)
youtube.com
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Entertaining dive into hands-on-wrench, nitty-gritty tangible reality where this guy seems to have gone a bit out of his head over some flat washers. He starts out with a pair of calipers, progresses to 2 types of micrometer, and even tries his hand at probing them with an analog tool with dials.
Rarely submit to HN, but I regularly enjoy content created by lots of interesting-but-virtually-unknown people and today seemed like the day to try to do my part to help at least one of them find a bigger audience.