I didn't mean to imply Gunter did that rib in the picture. But its the only one I have that has that technique...and it's a bad example.

Originally Posted By: Chuck H
Gunter Pfrommer showed me how he does the "file cut" rib matting.

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A small piece of a mill file can be silver brazed to graver shank. The bit is sharpened. The graver is then chased at an angle. Very simple process.