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Old 09-13-2014, 05:44 PM
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ChuckG ChuckG is offline
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Join Date: Jan 2009
Location: Newport Center, VT
Posts: 70
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I used one of these to make the hole and it cuts a very clean and neat hole:

Greenlee 7211BB-1/2 Slug-Buster Knockout Punch Unit, 7/8-Inch