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Practice with a straight that's not sharp or a butter knife. Watch the videos on here it'll take time but the knack is to roll the blade on the spine as you move it up and down the strop. Try rolling...

As fine as possible to achieve the desired result. Not quite sure what you're asking in the second part of your post.

Ok I think you may be able to do something with this. Sand down the cuts, just the cuts. Keep feeling the area with your finger tips. Once they ride smoothly over the damaged area stop sanding. Get a...