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Sounds like you could have a flex problem.
Re Backlash... No problem on RA, as the motor is always moving in the same direction at guide speeds (ie 0.3x 0.5x & 2x).
Backlash can be a problem in DEC, but only initially. If you have to do any adjustment in DEC it will only be correcting in one direction. Also any DEC correction that it is doing is because of mis-polar-alignement. If you are perfectly polar aligned then you can turn DEC corrections off. I actually do quite often if I have poor seeing, as DEC corrections can often do more harm than good.
Cheers
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