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All of the above.......
My Piggybacked 4" SCT guide scope is rigidly mounted to the main scope but still exhibits some movement over the course of a nights observing (field rotation of about 0.5 degrees) and I am within 1' of Polar alignment (according to polealignmax)
The point likely to cause the bigegst problem will be the adjustable mount between the Autoguider and the scope. You will need to find a way to adjust then lock down the joint (ie make rigid).
Cheers
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