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Enlarging a hole

Saturday - January 7Views: 291Taken at Inner Harbor Baltimore
Hayden recently described a method to enlarge a hole using a technique he learned from Mack Sails. Basically involves nesting holes saws so that the smaller one (that made the existing hole) acts as a guide for the larger hole. But when I tried that using my standard arbor (?mandrel) the smaller saw didn't protrude beyond the larger one and it wouldn't guide. But then I came across the Starrett KA19-N "Oops" Arbor, Hole Enlargement Arbor which solved the problem
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