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You would think that reproduction would wear them down, unless yours is a lady and the gestation period is very long :) as an aside the CBN strop is still going strong thanks.

Marty they are 10 or 20mm. I am impressed that your 3/8 stone is now 1/2 in thick. That means it has grown by about 3.2mm or 1/8 since you got it :)

As has been said, unless you are going to do...