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When I poured my slab I also marked the NS line but I did mine using the house plans on the computer. I knew the line of the boundary fences and used trigonometry to make an obtuse angle triangle where the long side ran due north and south right through the centre of the pier.
However when I set up the wedge I found the true 90 degree point of the OTA then adjsted the wedge til I could frame the south pole in a 26mm eyepiece because I already knew how to find it and what it looked like in a 26 mm eyepiece.
I never bothered with a drift alignment.
Barry
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