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Has burr formation been a problem for you? It's never been a consideration for me with razors.

Use wet/dry sandpaper and anything from 180 to 1k grit will work just fine. Of course the lower grit will get it done faster.

Because it is hard, it will be really slow to go out of flat enough to matter. For that reason, sandpaper on glass would be fine for that one. Whether or not you want to invest in a diamond plate...

In most cases a JNat is going to be much harder than those two hones, so it is much more likely that you actually are lapping them with the JNat.

Are you doing this because you don't have anything...