Thanks for all the replies to this!
All these years I somehow managed to not hear about this issue,
which it turns out is very common. Most suggested spacers under the
rotor, along the lines I was thinking. Several folks also suggested
preventing water from running down the mast by putting a roof flange
on the mast above the rotor or covering the rotor in some way. I
will add spacers as soon as I am able to get up there. It is always
a fairly thin layer of ice, so getting the rotor up off the shelf a
bit should prevent the ice from preventing rotation.
73,
Paul N1BUG
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