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Don't simply adjust the belt "tight as hell.' I'm not bashing, but you want to adjust the tensioner to spec, according to a repair manual. That way you eliminate the screech of the belt slipping, and also you don't cause unnecessary stress on the bearings and pulleys.
if you adjust tighten the belt, and it still screams at you, it could be that the pully needs to be replaces because it's glazing over from the previous belt. i used to be a tech at both toyota and mazda and that problem can happen after time.