This is description of this part:
Mounting screw for the photo tube / camera tube in the trino port of the Nikon SMZ-10 stereo microscope.
The trino version of the Nikon SMZ-10 stereo microscope has a modular photo output. Into the integrated, universal part of the trinocular you insert a tube ending with whatever mount you need. And this is exactly the original screw that holds that optional tube in place.
It is not a screw of any exceptional shape, but many users value having an original part.
What is this part needed for?
- if this screw is missing or damaged in your Nikon SMZ-10 stereo microscope and you want to fill that gap with an original part