I am working on a Cub 1330 where the person put the arm that has the idler wheel for the belt tensioner for the mower drive belt in the wrong place. I know it is bolted to the under frame of the mower. I reattached it to the threaded hole on the mower chasis but I can't find a hole for the tension spring. I have the the idler wheel toward the pulley on the mower deck.