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Help = Locked Microscope Adjustment Knob?

Beth S

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We've borrowed a friend's National brand Microscope, a standard homeschool model.


However, we cannot get the coarse adjustment knob to turn.  It seems locked.  Therefore, it cannot focus anything.


We've checked the instructions, etc.


It has not been used in probably 10 years, & had this problem once before that someone fixed.


Any suggestions? 



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