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Here's a vid of mine doing it as well. It seems to be intermediate, since some times it'll do it, and other times it won't. Happened as I was getting back to work after going to the bank and getting lunch.
[ame="http://www.youtube.com/watch?v=UK_4uZz-oQo"]BRZ Chirping - YouTube[/ame]
You can also see the idler pulley moving back and forth in the vid too.
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