Tony why not pull it apart and replace the greese and clean it, polish stuff and generally make sure everything is as good as it can be.
I followed instructions from a guy in Spain and the instructions were in Spanish but that was probably ten years ago so I can't tell you the specifics of what he laid out.
But I had that mount running extremely well..I recall there was PE training which helped.
Anyways just putting in new really good greese and clean up will do two things...you will improve it I expect and secondly get a look at the inside.
There probably are high spots on the gear teeth you can clean and polish but pulling it apart and reassembling will be of benefit.
Alex
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