Setting up the level believe it or not is the easy part, because you want it perfectly level with the horizontal line of the reticle just set up a Plumb bob (AKA Any heavy weight on a string) against a light background,
Place it as far away as practical to make the string the same thickness as your vertical on the reticle line these up perfectly then set level level and tighten to the tube.
This sometimes takes a little fiddling as the screw when tightened can move the bubble around the scope.
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