Olympus BX53M Instructions Manual page 110

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Attaching the nosepiece
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1
NOTE
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b
a
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Turn the coarse focusing knob to lower the stage sufficiently.
Loosen the nosepiece clamping screw using the Allen screwdriver.
Be careful, if the clamping screw is loosened too much, it
may be come off.
Insert the nosepiece from the front side along the nosepiece mounting
dovetail of the reflected light illuminator, and push it until it touches the end.
When attaching the coded nosepiece, put the cable a for the
nosepiece through the cable hole b on the top of the microscope
frame, and put it out to the back of the microscope frame.
Hold the Allen screwdriver between the pointing finger and the thumb,
and tighten the nosepiece clamping screw to secure the nosepiece.