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Hey Kees,:)

Currently, standards have been established so that we can tell what the distribution of grit sizes are in a given product ( more or less).
The 1200F, 4F and FFFF standards predate the...

I generally follow the approach of use the least agressive method first. If that does not succeed then go to a coarser stone.

In your case I would guess that the old oxidized steel on the edge has...