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Well, you could go the Escher and it will tell you right away how much 1 & 3K stria is still left, then polish it out with the barber hone, if it is fine enough, then a lot of laps on the Escher.

Yea, 6k at best, the problem is an Escher is a polisher, not a lot of range like the 12k Super Stone.

So you will either waste a lot of Escher stone or bite the bullet and buy a 4/8 Norton or 12k...

Did you lap and bevel the stones?

Are you making the 3k to Escher jump or are you hoping to fil in with the barber hone? I think you are at best optimistic with your grit rating on the barber...