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Stephen
I have a Skywatcher 12” GoTo Dob and from experience you need solid ground under it and the base has to be really level on all four sides to achieve good Goto accuracy
My dob sits on a concrete driveway, I use 4 adjustable furniture feet from bunnings ( 10mm threaded stud ) with thick rubber washers to sit under the base.I use a 17mm open ended spanner to adjust and good Stanley 300mm builders bubble level
My Goto is very good at each observing session after a 2 Star alignment using alignment stars at 50 to 60deg in Alt and 60 to 70 deg apart in Az
Cheers
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