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Old January 22, 2014, 09:34 AM   #4
geetarman
Senior Member
 
Join Date: November 18, 2009
Location: Arizona
Posts: 3,157
Good advice from Rifleman.

You could also use something harder than an Arkansas stone. Paul Gesswein company carries a line of synthetic ruby stones ( sintered aluminum oxide ) that work great on guns and small machine parts. I have been using them for 50 years. They are VERY expensive and they will break if dropped. They can be used wet or dry.

We used to use them in Saint Louis to deburr gage blocks without scratching the surface of the gage block. I have bought more assorted shapes and sizes over the years and the set that I bought in 1966 for $40 dollars is well over $100 today. You can get them in medium and fine grits and they can be cleaned with a white gum eraser or my making a slurry of scouring powder and water and rubbing them. They can be re surfaced by using dry boron carbide grinding compound and rubbing the stone over the powder on a glass plate. The carbide will break down into dust and will need to be refreshed.

I have never used a better stone.

Here is a link.

http://www.gesswein.com/c-321-ruby-stones.aspx
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Last edited by geetarman; January 22, 2014 at 09:39 AM.
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