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Last piece of advice. If you use the same spot each time for viewing put down a dab of paint or something similar at the points where the feet are for the base. Next time just drop it onto them.
I did it on my driveway before the Ob was built. Solar noon to get Nth Sth line then a big T square for east west. 'X' marks the spot(s). I actually spray painted a yellow N-S line and E-W and levelled it.
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