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I'm not convinced a constant side load on bearing is good.  It causes assymetrical wear.  Just seems to me a center balanced bearing with no lateral loads would be better.  Merely an intuitive hunch.

As for the copper, yes, it will ring all by itself.  But reaction is much different when sandwiched or clad.  I think what the designer is trying to do is an impedance match or translation.  We go from soft vinyl to a hard and damped sink.  Putting the vinyl directly onto the mechanical sink is not right.  The idea is to convert from one impedance to another in a broadband manner.  Same as with a horn!  That is what rubber or felt mats do on most tables.  The copper on the Raven replaces the mat.

jh

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