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Old 07-05-2004, 11:46 AM
matt de maria matt de maria is offline
 
Join Date: May 2004
Location: gaithersburg,md
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I use a "nail set punch" (I am not a carpenter). It is a small punch with a tapered point. I just hit the rim of the aluminum to cause a bulge at the top of the wall. One punch every 120 degrees.
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