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The coarse focusing mechanism is the rough focus knob on the microscope. It is used to move the objective lenses toward or away from the specimen.
Doorhandle.
A lock on a door knob.
Why should the fine adjustment knob be used only with the HPO
The book says it takes 31 foot pounds to put it on so I am thinking it will come off with force. The book doesnt say how to disassemble it so not sure. All I got. there is a small clip on the front of the shifter knob, near the top. pry this out with a pocket knife or similar and then remove.