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Old November 25, 2012, 10:20 AM   #16
guncrank
Senior Member
 
Join Date: July 15, 2006
Location: Fern Creek ,KY and Metro Louisville at large
Posts: 317
Drill out
Then use a standard counterbore.

Figure out the smallest one

As for drill bit not working , well if the crown is square and concerntric to the bore, does not matter how it was formed.
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