Re: I can't get the sensor to fit
@Big John
You seem to have a naive expectancy that any assembly line worker would really think about the criticality of any component, or take more care because of that.
It might be the case that the sensor was simply dropped whilst being handled, and then put on anyway, because the alternative is for the worker to own up to damaging it, and suffer the consequences - which might be punitive.
I wonder what you would do in the circumstances?