Motorizing a Microscope stand that was too stiff!

Hi there,
It has been a while since I haven’t post.

Like 2 years ago, I bought this little Microscope on Ebay for 20$ and it was really fine.
The only problem is that the small screw to scroll the microscope up and down was sooooo stiff I couldn’t do it manually.

I decided to plug a DC geared motor to the screw via a Hub and some metal pin to extend the screw head.
Check the video of it in action here: