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I'm with Euclid: cell rot. This is a bit of a guess, but judging from the pictures, it looks to me like the last 2 cm of the edge at the toe have been rotten through, as the cell rot from the...

I meant that the 400 grit hone may be causing new nicks to appear at the edge, because it is making such deep scratches that leave the remaining metal too thin, causing it to crumble. The 1000 grit...

Try to move on to the 1000 grit and see if that can remove the small nicks. Could be the 400 is too coarse for this particular razor. Just a thought.

If you decide to cut off part of the razor,...