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If Skywatcher are as good at installing their bubble level as Celestron are, don't believe it for an yoctosecond (ie 0.000000000000000000000001 sec).
Check yours with a straight level or digital gauge which can be flipped end-for-end to eliminate any error in the level. You may find when the tripod top plate is level the bubble is not even inside the centre circle.
You could mark the proper location with an ink spot.
Also, the radius of curvature of the glass/plastic top of the level means it takes a fair amount of change to make the bubble move. Compare that with the two straight levels on a G11 which have a much greater radius in them. Adjust one of the legs by a millimetre and the bubbles move.
Andrew
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