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Could make sense mate, a bearing out there could be righting itself temporarily at faster revolutions but then wiggly jiggling at slower speeds. The forces on say your idler bearing aren’t pulling exactly true when the guts of a bearing out there start to wear, slight cartwheeling could be starting before it completely poops itself. You could take the belts off firstly and have a good wiggle and spin of them all first to hopefully isolate the noise location further
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