Poiuy,
I just saw the pictures, now I understand your question.
The gear showed by the arrow is Z = 40 and mod = 2.
All other gears following this gear are mod 1.5.
What's wrong with your lathe?, as I see in the photos, all the gears are in place. You only need to adjust the apron loosening the bolt located behind the gear indicated by the arrow and upload it to fit the previous gear (with mod 2).
This weekend I will take some pictures.
German