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Old 06-03-2015, 08:18 AM
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Steve Steve is offline
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Join Date: Jun 2002
Location: Manti, Utah USA
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A lubricant - and a coolant. It helps cut without making that little "circle" around the edge of the hole. Anything to make the drill and c'bore cut clean. But remember: If the tool isn't dead sharp the chance of problems increases dramatically, no matter how much lubricant, or whatever is applied.


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Last edited by Steve; 06-03-2015 at 10:11 AM.
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