I don't know where you get I was unfriendly at all. That's your misconception. That was not my inference. All I did was say it was a single spring. That was neither friendly or unfriendly. For me to know your understanding of "what" a single spring is would have required me to read your mind over the internet. We all know that's impossible and it's also impossible that I know what you know or your terminology, so I gave you the answer in my terms, which is all that I know. Sorry you misconstrued my answer as "unfriendly" as it was not meant as such.