Quote:
Originally Posted by Dave Bernard
Why not just cut a square? Proseal will seal it all up just fine.
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Good question. :-)
Whatever shape the hole, another option is a 'trim router' or 'cutout tool'
http://www.harborfreight.com/14-in-t...ter-61626.html
http://www.harborfreight.com/electri...ool-42831.html
and a plunge type spiral cut bit. You can get high speed steel and carbide bits at any big box store. If it will cut wood, it will cut aluminum. Same principle as the circle cutters shown in earlier posts, but the tool has other uses, too.
A plywood or MDF pattern could be clamped to the back baffle, so that the bit follows the inside of the hole pattern.
Charlie