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How strange... 
I was thinking about this, and discussing it during lunch @ the lab a couple days ago... 

Got there from a totaly different direction though, was thinking about harmonic vibration dampers used on crankshafts, (usually iron, rubber ring, another iron ring), and how better ones use a viscous fluid instead of the rubber. 
We went crazy hi-tech (of course, it's Los Alamos), and were pipe-dreaming ferro-fluid or something that could be used to actually change viscosity, as needed to make subtle damping changes, for subtle speed changes. 
Viscous ferro-fluid could be used for magnet drive for turn table...
No, that would cause interference with cartridge... 
Then realized that was too carried away, but something like glycerin, in a ring you could see might be nice. 
Then back to playing with plutonium & platinium...

Now I'm gonna be imagining Cat driving Train all day... 
Robert

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