Steve,
You are on to something
Intertia is the key here. (Thanks Newton
)
I tried differing amounts of tenision on the belt, more tension *seemed* to diminish the rattle, but not emliminate. There must be some sort of mechanism in the roller that is awry. I don't think the shop manual has an exploded view of the rollers, so removal might be in order.
Thanks for your help!!