Here is a vew of the Zeiss universal measuring microscope, with digital Mitutoyo micrometers measuring to 0.001 mm precision. The profile projectector is in the background (covered in order to protect from dust).
The case before inspection.
Checking the integrity of the hole. The stem is centered correctly.
The portion of the crown that is broken on the stem. The sleeve of the crown resulted being too thin for the torque it received.
Another view of the stem, with the portion of the crown still attached.
The movement is seating inside the case slighly high, and the winding crown is slightly off center.
It is off center by the following amount. It is minor, but enough to create stress on the teeth as they engage.
Here is a vew of the winding stem teegh and how they engage with the watch's main rocking lever wheel.
The teeth of the winding gear are short in order to avoid seizing in the gears, but they are uneven in thickness, compounding the eccentricity of the winding stem position in relation to the movement.
The cutter is shaped appropriately, but the winding gear requires proper terminal points for its teeth.