First, I presume we are talking about the pull-up/pull-down cables, not the
tilt/raising winch cable.
I think the confusion comes from the fact that the Tri-Ex LM-354's used to
ship with 1/4". My LM-354HDSP was one of the later ones (probably built
around 2001 or 2002) and it came with 1/4". The LM-354's now ship with 3/16"
according to the website.
I've already replaced the 1/4" pull down wire rope with 3/16". (It was in
very bad shape when I acquired the tower last year.) The pull ups will get
replaced in a year or two.
I've posted before on the topic of sheave/pulley diameter and wire rope
size. The sheaves on the LM-354 are too small for the recommended bending
radius of 1/4"; this will cause excessive wear on the wire rope. There is a
tale in the archives of someone who replaced 3/16" with 1/4" and suffered a
premature failure.
Doug
K4DDR
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