Good chance there are a couple of teeth missing on the large ring
gear. Did you have the antennas "parked" at 285 deg. for a while
during a big wind?
I'm sure the experts will chime in, but that seems like a lot of mast
for a Ham-m. I had lots of problems with rotors near the top of the
tower, often losing some ring gear teeth, but excellent success with
the rotor down in the tower 8-10'.
With the rotor only down 4', that thrust bearing makes a real nice
"pivot point", putting mucho sideways stress on the rotor. If all the
teeth are still there, then you have an alignment problem with binding
at that point (285 deg).
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