The harbor freight pulley spinner tool works awesome. Get one if you have to do this. Small and cheap. The rubber part -- edit it's not rubber , it's black metal -- goes over the belt and metal part inside pulley and torque to right and it tightens . Awesome. Thanks for the tips. This is the best counter hold tool for serpentine belt i have seen (only one too ).

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius