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The Norton 4k/8k works fine.

On a budget? Woodcraft is having a clearance sale on 3 2"x6" DMTs: 600, 1200, and 8k for U.S. $60. Add a coticule, Chinese 12k, a fine barber hone, or anything else...

Yes, just knock the sharp corners/edges back a bit. I usually hit all 12 of 'em while I'm at it. Less likely to micro-chip a razor's edge and can reduce hone damage if accidentally dropped.

I'm not familiar with that particular brand, but I have lapped quite a few barber hones.

I start at 325, or 120 if the hone is a harder one. Sometimes I stop at 325, sometimes I finish as fine as...