Years ago when I bought the Tristao 71 foot crank up. Bob Henry tried to sell
me a Rohn thrust bearing. I corresponded with Lou Tristao and he said since
the tower had what he called a side bearing or sleeve bearing which kept the
mast straight. He recommended a radial thrust bearing to protect the down push
to the rotor so the rotor would rotate the beams easily.
I bought a Fafnir 2 and 1/6 inch bearing that lasted for over 40 years, Lou
told me that if the tower did not have the sleeve bearing in the top section
then a thrust bearing was best as it also protected the side moment. I put a
Rohn 45G tower with a straight top and bought the heavy duty DX engineering
bearing.
Dave K4JRB
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