There are two plates, one that the gearbox bolts to and one that is part of the mounting frame. The one with the 4 carriage bolts in your picture. Do they slide independantly of each other? I've seen where they are bolted up tight and they should'nt be. The plate that the gearbox is bolted to should slide down when you tension the belt. I would check there first. There should be some 3/8 spacers in there keeping the plates apart.
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