You can try it anytime you like--by using the nightlies. It's there.

Upon reflection, you are right that although it directs you to turn the elevation knob, if your mount is not level,
then that won't quite do the trick and you'd have to improvise.
Clearly best to level the mount as best as possible.

Still, if you iterate, you'd likely get close to a good alignment in any case.

Hy

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