Still slightly in progress: height adjustment knob missing and tightening the lower 2 nuts in the base are a pain.

made for USB microscope bought from Banggood.com: https://www.banggood.com/DANIU-New-USB-8-LED-500X-2MP-Digital-Microscope-Endoscope-Magnifier-Video-Camera-with-Suction-Cup-Stand-p-1132026.html?rmmds=buy

You might want to adjust the actual holder part to be a little tighter, but for me this was good.

Slider is is made to hold 2 standard OD16 x L25 sliding bushing for 8 mm shaft. Screw size M5.