>
>I'll bet anything the error came in the CAD Schematic/PCB library 
>component construction for that part.  Part was probably installed on the 
>board exactly in the orientation shown on the silkscreen & passed all the 
>visual 'inspections'.  2 switches in each of two systems, all laid out 
>from the same pcb library & all wrong.

That's where I'm thinking that a different sort of switch would have saved it.
Very unlikely to get two drawings wrong, from two different makers.

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