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Message: <blockquote data-quote="a33" data-source="post: 1085728" data-attributes="member: 332642">You are absolutely right.What counts is the motor axis angle due south, against the vertical. (So not against the pole!)That you set at the (modified) motor elevation angle.It follows that if the pole is 1 degree off, then the motor elevation as seen on the motor scale (if that would be precise...) must be compensated by 1 degree.When you set it with an inclinometer, against the vertical, you just watch the inclinometer scale to get the (modified) elevation angle.East/west nonplumbness of the pole is indeed BAD for following the arc.Greetz,A33</blockquote>