Here is the method I use to plumb my guyed towers:
I set up two plumb lines made of thin wire carrying
some old 5 lb 'window weights'. These plumb lines
are roughly 60 ft from the tower and at right angles
to each other when viewed relative to the tower.
I then sit on the ground with my feet in front of me
and arms / hands behind me to provide a stable
base for my head / eyes and sight one of the
tower legs along the plumb wire. I estimate that
I can get the top within a couple of inches of 'true'
using this method.
Others have hung a long plumb line down the center
of the tower, using 3 lines from each leg to the opposing
horizontal brace and suspending the plumb line from
the intersecting point of the 3 lines.
Tom N4KG
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