I read somewhere that you could use a bicycle pedal. Use the side that has right-hand thread, and you can use that threaded end to mount it to something, and the top end already has a dust cap on it. Cut off the rest of the pedal. This would be good for heavier loads and where there is a risk of weathervane being lifted off. From a pracital point of view, I like the single ball bearing idea though.
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DonS
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