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My dad needed to cut a hole in the roof to install the exhaust vent for a tankless gas water heater. The problem was there were multiple layers of "roof" and we didn't have a drill bit long enough to go through all. I suggested we get a center point for the holes by shooting a hole through the roof.
I've got a video of my dad holding a gun with a couple bubble levels on the barrel and shooting a hole through the ceiling.
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