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Rounding off the ends has nothing to do with "safe." The long sides are rounded over in case the blade is not kept flat on the hone. Rounding over the ends serves no purpose other than aesthetics,...

You need to lap it flat and, especially since you are a beginner, you also need to chamfer the two long edges at the top of the hone. You can do this with a sheet of wet/dry sandpaper on a flat...