I've owned various aluminum towers (all Universals) since 1976 and currently
have an 80 footer with TH6DX on top.
I definitely recommend stainless steel bolts, washers, and nuts. I switched
to these after finding consistent rusting of the plated bolts supplied by
Universal. You can buy
a stronger stainless bolt from various suppliers. However, for my bottom
section, I did
use plated Grade 5's which I painted with antirust paint.
I coated the legs between sections with the anti-oxidizing compound usually
used to
put antenna tubing sections together. This is important to prevent seizing.
K4XS is absolutely correct.You must put some type of grease on the bottom
legs before inserting them in the steel stubs or you will never get them apart.
When you tightening the bolts, a bit of compression or distortion of the
tubing is
mandatory. The Universal factory calls this "crush." If you have hole
elongation, it
is usually because you did not have the bolts tight enough. The factory told
me that
the holes can be drilled out one size more MAX, that is, to 7/16 rather than
3/8. I've
not tried this because it means that the two sections cannot be used with
other sections unless those are drilled out too. I think a very talented TIG
welder could
fill up the holes with new material. An the aluminum tower can be successfully
repaired within limits by a skilled TIG welder.
Lastly, according to the factory, the Universal tower can be successfully
guyed like
any other tower BUT it cannot be overloaded in any configuration.
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