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Check out this 4 page PDF from the 1961 barber manual (SRP library) It has illustrations and text that will help you out with maintaining, and even improving, the blade profile. See the illustration...

Depends on the profile the blade has to start with. If it has a slight, or more, smile, the rolling x is the way to go. If it is a straight profile from heel to point it might be just as well to...