Spot Light for stereo microscope

I bought a used stereo microscope.
It is SZ type made by Olympus and it is a model of 30 years old.
Since the microscope had no lighting equipment, I made it by myself.

This micro scope is used for soldering the electronic circuit board.
Generally, ring light is used for illumination of a stereoscopic microscope.

However, when illuminating the Printed Circuit Board with a ring light,
surface of the PCB glows hard to see.
Therefore, the spotlight system was adopted.

The LED light bulb used the T20 type for automobiles.

The hood made by cutting a coffee bottle.

The butterfly screw used M6.

The filament used ABS.