Have a look at this guide, you might be able to adjust it.
"Run the mounts RA motor a full 360' to make sure there is no binding at any point in the cycle.If binding occurs you will need to readjust the set screws. This can be a long process to get the perfect balance between no play in the axis and smooth motor running."
http://www.astro-baby.com/heq5-rebuild/heq5-we1.htm
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