This is a stand for this inexpensive USB microscope, available from many sellers under many names: https://smile.amazon.com/gp/product/B06WD843ZM/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

Use an M4 screw as the set screw for the slider. Future revision will include more thickness at that point for threads. I used a piece of 3/8" threaded rod for connecting the clip to the slider, but plastic rod stock or even a printed part would work as well.