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I'm not sure, but it definitely works for aluminum too. I was having a HORRIBLE time with aluminum before doing that. If you are doing a really deep hole, add a few drops down the hole, drill maybe 1/8" of an inch, pull it out, repeat. It's sort of tedious, but much easier than the alternative.
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When I die, I would like to go peacefully, in my sleep, like my grandfather did. Not screaming and yelling like the passenger in his car.
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