Focus Adjustment Knob for Digital "Microscope" Magnifier

Inspired by Big Clive https://youtu.be/p1UIa8nRAgA

Adjust the focal length of your cheap digital magnifier.

I didn't need to open my magnifier up, the lens turned with careful torque breaking the glue seal. YMMV.

Be careful, if you press too hard you'll skip the lens in by a thread and have to wind it back out another turn. Do that too often and I imagine you'll wreck the thread.