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Second one at 2:11 He uses a lead ring instead of a thumbnail because he probably checks a hundred a day :) to test the grind flex..

Do that same thing, and run the edge from heel to toe watching...

Have you seen the Thumbnail test where you set side of the bevel of the razor on your Thumbnail and watch the bevel flex as you draw the edge across the Thumbnail ????

IIRC they show it in the...