１.When the bubble is on the right,
turn the left adjustment foot clockwise
or counterclockwise to adjust the right
adjustment foot.
2. When the bubble is on the left, turn
the right adjustment foot clockwise or
counterclockwise to adjust the left
adjustment foot.
3.When the bubble is in front, rotate
the rear adjusting foot clockwise or
counterclockwise to adjust the front
adjusting foot.
4.When the bubble is behind, turn the
front adjustment foot clockwise or
counterclockwise to adjust the rear
adjustment foot.
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