I'm such a hack. Used a ratcheting box wrench and a pipe to turn the tensioner nut. The wrench got stuck with the belt 3/4 of the way on the ac hub. The whole thing was stuck and wouldn't budge. Had to get angry at the wrench to get it off the tensioner. The belt was still 3/4 on the ac hub. Tried to loosen the tensioner but the nut was rounded. Started the engine hoping for the best and the belt sat itself on the hub fully. The tensioner is fine but the next time will need replacement. Got lucky. Still a hack job. It was on my wife's RAV4 so she's not thrilled.
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