[TowerTalk] Trust Bearings

[Noel]

I'm trying to decide what type of thrust bearing to use at the top of a
60' tower to support a small quad.  The antenna only weighs 35 Lbs but I
want the boom as high above the tower as possible to keep the elements
above the guy wires and get about half the antenna above the tower
rather than around it.  So I'm thinking of using a 12ft mast with about
6 ft of mast inside the tower and a thrust bearing at the top for
stability and keep some pressure off the rotator.  

I'm Looking for suggestions on what type/make trust bearing works well
and will hold up in icy winter conditions as well as the heat of summer.


Appreciate any recommendations.

Noel,