Drilling a Straight Hole (Overhead, Into Concrete)
SMS wrote:
Maybe you could adapt "http://britelite.com/Products/get_one.html" to
fit your needs.
Interesting, altho a bit expensive and maybe unsuited for concrete.
We might attach a laser pointer to the drill, aimed exactly backwards,
and mark a spot on the floor with a plumb bob from the hole location,
then drill while keeping the laser aimed at the spot on the floor...
Nick
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