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Old April 9, 2010, 04:20 PM   #9
youp
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Join Date: December 15, 2005
Location: south of Canada, eh?
Posts: 438
The roll pin I have tried to drill seemed to be considerably harder than the HSS bit I was using.

It is safe to assume you are using a punch that is just slightly smaller than the diameter of the hole the pin is in and tip of the punch is flat.
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