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Hi Peter
From your description it appears that you have a problem with the mount itself. I doubt if backlash manipulation will correct it. You said you removed PAE did you also cancel out any old PEC. PAE is just a work around for a poor polar alignment and PEC will not be critical till you try high magnification without satisfactory guiding. If you are photographing wide angle ie. FOV greater than 1 degree arcsecond errors are going to be insignificant.
It could be just an inadequate power supply. I use a regulated 13.8 v 7 amp supply on mine. The intermittent nature (from your earlier post) points in this direction
Another area may be in the meshing of the gears. If they are too tight they will certainly cause problems. (I have tested this)
The mount is second hand. Is this the reason it was sold?
Barry
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