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I had to flatten two Barbers hones. A Swaty & a John Primble. I have had no problems with either & really didn't have much to take off of then. I am not a fan of most Swaty barber hones but this one will give a pretty fair touch up.
The J. Primble is as good as many finishing hones I have used. Just picked up a Raven Barber hone it puts a good retouch on a razor.
How flat is the Coti?
Slawman
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Well, as far as the Swaty is concerned:
https://scienceofsharp.wordpress.com...e-barber-hone/
I was assuming that most that were made in that era would be constructed similarly.
With that said, unless there's a concise list that let's you know which were made of fine grit (easy lap), which are coarse (will need burnishing), and which might fall apart it's a gamble.
So IMO, the safe bet is to take a razor that's been a shaver and maybe just starting to tug and see what the hone does. Give it 4-5 laps on the hone, strop it, and see if the blade can shave. If it's an improvement give it 4-5 more, strop, shave. If the hone works, let it ride. If it degrades the edge, maybe then make the decision to lap it.
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3 Attachment(s)
The coticule definitely needed lapping so I went ahead with it. Lost the stamp but I knew that would happen. This is a very hard coticule and took some effort to get lapped. Now it's flat and ready for service.
Attachment 254484Attachment 254485Attachment 254486
I'm going to put the little AM Hone aside for a while until I have some time to play around with it. I think later I'll do as Marshal suggested, try it on a blade that's tugging and if the result is not good maybe lap it then.
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Very nice piece of Coticule!!!