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I have a fisher stereo microscope on boom stand. When I rack up or down the body keeps falling as it is unable to keep its tension. What can I do?

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You need to tighten the coarse adjustment screws to provide more tension so it sticks. Leave the fine adjustment as it is, it works on a different system. It's the coarse adjustment crank that is slipping due to the weight of the stage and lack of pressure from the screws.

Posted on Oct 12, 2009

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Turn the 2 coarse focus knobs in oposite directions. Do not turn to hard as it will break off the head of an internal screw, but it will add more compress to the focusing mechnism, thereby preventing it from falling. If you need a new one, you can buy it through Fisher. Just call them and ask for part number ZP-PV-000001. If they cannot find that part number in their system, have them call the vendor AMG

Posted on Dec 30, 2010

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