Sounds simple - how do I cut a neat 1" round hole into hot air duct?
Its flimsy and I can't get behind it easily. I don't have an air nibler
either, and would rather not buy one if possible.
If the link's broken, go to www.homedepot.com and search for "hole saw". You
also need an arbor. The arbor holds a 1/4" pilot bit which sticks out maybe
1/2" ahead of the cylindrical hole saw. The whole setup will cost you about
$25. If you get the right arbor, it'll be usable with a variety of hole saw
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