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The next step down would be the 10-12kand learn to maintain the edge, 5-10 or so light laps.
When you begin to actually hone your razor go to the 4-8k.

This is only my opinion but with a finisher...

"The life of a razor is in decent treatment
two to three generations. The sharpness holds about 1,000 shaves, then
the razor should be deducted again on the stone. Then
considers it again in...