See this link for latest video > http://www.youtube.com/watch?v=IdWc4DLxtXM
Also see the thread in the mechanic section titled, "This Might Could Work"
Also see this video from past research that shows easy movement of magnets between bars.
See this link > http://www.youtube.com/watch?v=qZqJhm_8LpA
Thanks,
Ray
seems interesting, too tired to estimate if it will ever work :)