[CQ-Contest] Swing arm assembly???????
btippett at alum.mit.edu
Wed Feb 10 16:43:55 PST 2010
> Try this
little thought I reverse-engineered the design and had a neighbor who
does race-car fabrication make one up for me - much cheaper. He used a
piece of a plastic cutting board for the top bearing - still going
strong after 6-7 years.
Mine have no bearing at the top...just a sleeve which the top of
the rotating mast fits into. It's not that critical just so you don't
have a huge amount of play at the top. These have been up 10 years
with no problems:
73, Bill W4ZV
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