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Old 07-08-2006, 09:10 AM
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Korey Harbke
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Diamond bits are weird.... I knew mine was done after there were swirl marks on the com after I was done cutting. After careful inspection, I notcied there was a chip on the tip itself. I replaced it with a new one and the finish came back. A good finish with a diamond bit leaves a slight rainbow or CD like finish to it. That lets you know it actually cut the copper and not just smosh it around.

-Korey
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