Hi Ian & Ofer,
You are comparing apples and oranges.
In a PTV barrel strength is the issue and the Ni plating is quite a bit
stronger than the underlying Cu plating; hence, "electroless [Ni] layer hangs on in
there long after Cu beneath it has circumferentially cracked."
In contrast, for press-fit terminations ductility is the required property;
ED Cu is much more ductile than the EL Ni, hence Ni is  a liability.
Ofer, in your language idioms:  What to you make of an expert with experience?

Regards,
Werner Engelmaier

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