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If the coticule feels rough to you it really doesn't matter some just feel that way because it's a natural rock, FME. You can lap it with a dmt 325 or wet/dry sandpaper and then lap it again with a...

It's funny how due to shaving forums, old coticules that would've been thrown aside from not passing grading standards are now considered the collectible ones lol.

How does she cut on slurry? IMO the slower the coticule the easier it's been to achieve an edge using the Dilution method since there's less of a gap in dulling slurry to water.