[TowerTalk] One thrust bearing vs. two

[john at kk9a.com]

I concur, plus the u-bolt keeps the antenna from spinning while the rotator 
is removed!

John KK9A


To: towertalk at contesting.com, tod at k0to.us
Subject: Re: [TowerTalk] One thrust bearing vs. two
From: K7LXC at aol.com
Date: Wed, 12 Aug 2009 11:58:07 EDT

The alleged purpose of the  middle thrust bearing is to hold the  mast 
vertically to aid in rotator  replacement. You don't need a middle 
 bearing - all you have to do is capture the  mast. You can do that with a 
rotator  plate sans bearing or fabricate a mast  holder made from a couple 
of pieces  of angle iron and U-bolts. You just install  it when you need it.

 A mid thrust bearing can  potentially add more bind in the  rotator/mast 
system. The tolerances are  relatively large and some misalignment is 
common.

Cheers,
Steve    K7LXC
TOWER TECH -
Professional tower services for hams
Cell: 206-890-4188