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Could be that the bevel is not properly set. If they have been shaving well then probably not unless they somehow got damaged. Remember that is doesn't have to be along the whole length. The edge can...

You can help yourself greatly by getting some SIC powder in various grits. That will make life much easier and, IMO does a better job than the flattening stone of leaving a smoother and more...

The main issue is not usually the surface roughness as making sure it is flat. Very often stones are not flat even from the factory or the quarry in the case of natural stones. Although from my...