USING A PLUMB BOB
The practice procedure which follows (for
establishing the true vertical of a post)
uses a plumb bob with a removable head.
The first step is to attach the cord as follows:
Insert a string or cord (1) into the cap (2) of the
plumb bob. Make sure the cord will support the
plumb bob. Pull the cord through the cap.
Place cap in the palm of your hand and tie an
overhand knot (3) in the cord. Pull the cord drawing
the knot against cap base. Make sure the knot is not
too large or tied at an angle which would affect the
hanging of the plumb bob.
Install cap into plumb bob body (4).
Tighten cap securely in the body and suspend the
plumb bob by the cord only. Make sure the knot will
support the plumb bob.