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Peter,
If you physically apply varying pressures to your RA axis in both directions, Do you get physical movement showing up at the camera ?
ie are the stars moving in your images - could be done by looking at elliptical stars in a finished image or by blinking and seeing the movement between a sub with RA load and no load.
You would need to try both directions.
If you start back at the camera and work your way forward to just the OTA/Mount you may also discover where that movement may be coming from, including from within the mount if that is where it is.
You would expect to get some movement, the issue is if its actually backlash which would usually show up as movement with two fairly finite end stops or if its gradual based just on the strain which just gets larger as the load gets greater.
You would still get both of course if you have backlash.
If you are concerned about your cables you could check to make sure the cable loop around both axis is sufficiently large enough (as per the original loops) and that the cables are not bound up.
Adding too many extra cables could be a real issue.
Some silicon spray may help, but if its tight start by removing one cable.
I will assume that you have left all cables loose and not zip tied or interwound.
Debugging this needs to be done by a process of either introduction or elimination of all possible causes - otherwise you are just guessing.
Rally
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