In article ,
Stormin Mormon wrote:
Buy two lengths of chain, about two foot long. Hire two helpers. Put a
screw about a foot or so away from the hole, so the chains are at 12 and 3
o'clock. Let the chains dangle, they will be plumb. Have one helper at 12
o'clock, the other at 3 o'clock, guiding you. Using the chain to see if the
bit is plumb.

--
Christopher A. Young
Learn more about Jesus
www.lds.org

----- Same, but split up:

Buy two lengths of chain, about two foot long. Hire two helpers.

Put a screw about a foot or so away from the hole,

This screw is screwed into the bottom of the beam, facing the
floor?

Beams are narrowish, so the screw will be on either one side of
the hole-to-be or on the other -- ie only two possible screw-positions.
Yes?


so the chains are at 12 and 3 o'clock.

Here's the first place I get lost. The imagined clock
is mounted on the bottom of the beam?

On the side of the beam?

Where does 12 o'clock point to -- the ceiling?
Parallel to the ceiling?

Let the chains dangle, they will be plumb.

(Three dimensional space this stuff lies in.)


Have one helper at 12
o'clock, the other at 3 o'clock,


Same question.


Is one standing in front of you, and the other
out to your right?




Now, what do these helpers do?


guiding you.





Using the chain to see if the
bit is plumb.

And how does this work?



Thanks!


David