How to Tighten a Loose Focusing Mechanism on the Substage Condenser of an ML Series Microscope
 
 
 
Remove the condenser from its mount by loosening the front thumbscrew (red arrow) while holding the condenser so it doesn't drop.
Using a small Phillips screwdriver, remove the screws holding the black covers on the side of the substage.
 
Using a 2mm allen wrench, loosen the top and bottom screws on the front of the substage. 
Using a 1.5mm allen wrench, tighten the top and bottom screws on the side of the substage until the condenser rack is no longer loose and doesn't fall down. 
Using a 2mm allen wrench, tighten the top and bottom screws on the front of the substage. Replace the black cover to finish. 
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