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Maybe you press harder on an eraser than I do.
It's just a starting point though, and one would expect all the other checks and balances are in place; visual inspection, sharpie on bevel, etc. I...

I learned to gauge my start-point pressure by approximating the amount of pressure I'd use with a pencil eraser to wipe out a #2 pencil mark on white paper. I judge the results from that effort -...