Can a horizontal bar exhibit SHM with rotating wheels?

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Homework Statement



attachment.php?attachmentid=36132&stc=1&d=1307114550.jpg


The Attempt at a Solution



Please tell me how will there be an SHM?
 

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Maybe the wheels are rotating the the opposite direction than drawn in the picture.
So each wheel would be pushing towards the inside. In this wait an oscillation could arise.