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4. Release three nuts behind the third mirror. Rotate the
three screw equally so the mirror can move forward
or backward in a paralleled direction. Make the gap
between the metal pieces be X mm.
5. Release the lens holder ring by rotating clockwise
and lowering the lens holder to the mid-height.
Fasten the holder by rotating the ring counter-
clockwise.
6. Place a piece of tape to the beam outlet.
7. Refer to the steps of "Third Reflecting Mirror" and
readjust the screws behind the third mirror so the dot
lands on the center of the circle.
8. Release and remove the whole lens holder. Place a
piece of tape on the location shown in the picture
below. Apply pressure to make a circular mark on the
tape.
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