Beth S Posted January 10, 2016 Share Posted January 10, 2016 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? --B Quote Link to comment Share on other sites More sharing options...
Starr Posted January 10, 2016 Share Posted January 10, 2016 Can it be oiled? 1 Quote Link to comment Share on other sites More sharing options...
AmyontheFarm Posted January 11, 2016 Share Posted January 11, 2016 email the company and ask if they have any suggestions 1 Quote Link to comment Share on other sites More sharing options...
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