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the best i have ever done to my mount was use a fine stanley blade to clean up the surface between the worm adjustment housing and the main body on each side where paint had dribbled during manufacture.
I have never attacked it with sand paper. If you have to start sanding away material, send it back!
My RA and Dec does not spin easily and i generally don't sit there waiting for the weight to move it, i do a average i push the mount on the axis and observe how fast it slows down or how far it travels before stopping. once your weight is about right, youll find that the same amount of force each way will result in the same distance and speed that it slows down in.
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