Question about National Optical 138-MS Monocular Microscope
Just inside the coarse focus knob you will see a "chrome" ring with holes it it. That ring needs to be tightened just a bit. It will make the coarse focus knob stiffer so tighten only enough to stop the downward drift of the stage. A funny looking tool should have come with the scope. It is used to adjust this "tension" ring.
Posted on Dec 24, 2010
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Posted on Jan 02, 2017
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