Thread: How to fix a "crumbly" edge ?

I'm not sure the 1K will be fast enough to fix that much crumble. You could try a low-grit sand paper (say 220), holding the razor at a 45 degree angle rather than flat on the paper and making edge-trailing strokes only. Keep an eye on the shape of the blade, see that steel is removed evenly across the edge. That should remove the damage at a reasonable rate, after which you can set a bevel on the 1K. Don't be surprised for that bevel to take 45 minutes to set!