In a message dated 8/25/2007 9:02:02 A.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> Personally I see no reason for a second bearing and I see a huge headache
trying to line up a top bearing, middle bearing and a rotator on something
built as unprecise as the Rohn mounting plates. Your rotator already has
thrust bearings and it should easily accommodate the side forces at the
bottom of the mast if it's properly sized.
I totally agree. The reason for an intermediate plate/bearing is to hold
the mast in case of a rotor swap. That's it. The accessory shelf already has
a hole in the middle that'll do just that so the additional TB is
unnecessarily redundant and a waste of money.
Tower parts are not precision items. You take a chance on additional
bind when trying to line up the rotator and 2 TBs. It's sometimes challenging
enough just to get the bind out with one TB.
Cheers,
Steve K7LXC
TOWER TECH
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