[1] If the light spot is in the upper left corner of the circle, you need to turn the screw on the right to loosen it (counterclockwise);
[2] If the light spot is in the upper right corner of the circle, you need to turn the screw on the left to loosen it (counterclockwise);

[3] If the light spot is directly above the circle, you need to turn the left screw to loosen (counterclockwise rotation), and the right screw to loosen (counterclockwise rotation);
[4] If the light spot is on the right side of the circle, you need to turn the left screw to tighten (clockwise rotation), and the right screw to loosen (counterclockwise rotation);
[5] If the light spot is on the right side of the circle, you need to turn the left screw to loosen (counterclockwise rotation), and the right screw to tighten (clockwise rotation);

[6] If the light spot is directly below the circle, you need to turn the left screw to tighten (clockwise rotation), and the right screw to tighten (clockwise rotation);
[7] If the light spot is in the lower left corner of the circle, you need to turn the left screw to tighten (clockwise);
[8] If the light spot is in the lower right corner of the circle, you need to turn the right screw to tighten (clockwise);