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I was talking to a fitter in his 60's recently who had to learn scraping as an apprentice, he was telling me you use 3 surface plates and keep checking them against each other when scraping them.
Easy to describe, not so easy to accomplish. You get a high spot on the first plate it'll print against a non-high spot on the second. Then you scrape the non-high spot on the second plate and create a low spot, which will not print at all on the third plate. There's nothing quite so frustrating as trying to scrape something against a non-flat reference.