Belt Squeal, 97 Safari 4.3L

I posted about this back in March. I’ve since replaced the belt, tensioner, idler and water pump, all with AC Delco parts. After that, silence, for a while. We drove 2000 miles in six days over the weekend and now the squeal has returned. I’ve had it suggested that perhaps the pulley on the power steering pump is pressed on too far or not far enough, causing a misalignment. Does anyone have any experience with this?

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