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Rene,
I have a 1.3*1.3*1 metre lump of concrete under my pier. Absolutely still during imaging,PHD2 guide trace shows no sign of me walking around in my ob.
BUT the annual wetting and drying of the material in which it is placed means that polar alignment is required every few months.
So you probably have to be prepared for this, even following the advice in previous replies.
Chris
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