Leica S8APO Microscope gear

Replacement for zoom gear of a Leica microscope. It is compatible with several models.
In the photos, the original (and broken) gear can be seen on the left, the one with the brass insert.
I used the @janssen86 design to modelate the bevel gear, and adapted to fit the microscope. I also added some English comments for better understanding, but I left the code almost as it were.