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The idea is that breaking it in actually breaks those protruding diamonds out of the nickel setting. If you are just rubbing it gently, the nickel will hold the diamond with little trouble. In...

They're flat, but there can be singular diamonds sticking out. Scraping a blade over the surface with a good bit of pressure will break away those protrusions.

Ho wmuch pressure do you use?
you are expected to use fairly strong pressure when doing this. I don't know how much pressure you use, but if you are just using the weight of the thing you are...

Normally, the packaging informs you that you need to break in the plate before using it, for example with a plane blade or knife.