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yep, that's the way to do it, check carefully the progress at every stage and you'll figure out what is actually happening. The microscope can reveal some problems, but it may be the other tests that...

you must've been to medina recently... :p

no idea what's the actual problem, but here are my thoughts on few things that are definitely wrong.

did you look at the edge under magnification? it is possible that you mistook dull overhoned...