"Arfa Daily" wrote in message ...

Yes, you are right that William is "no newbie", but by the same
token, he is not a 'current' engineer, and may not be able to feel
the subtle differences that we are talking here, without understanding
the way his unit is put together, and the failure mechanisms involved
in these switches.

Which you have explained very well.

PS: I am very capable of feeling subtle differences -- especially in a product
I have used many times.