If none of the above suggestions work, I found a solution (around 7 years ago) for one of our fans that was doing exactly the same thing. The noise was coming from a very slight movement in the joint the fan hangs from, with the rounded ball mount. I installed thin (~1/8 inch) felt strips with some glue on one side to hold these in place. No noise after several years.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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