The teeth of the left side of 4263 are not correctly aligned (see link: https://bricksafe.com/files/stephan3321/Errors%20and%20Bugs/4263%20Error%20Mecabricks.jpg).
The bushing underneath should slot in between the teeth (like the right side).
Here another example of the error:
https://bricksafe.com/files/stephan3321/Errors%20and%20Bugs/Mecabricks%20error.png
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