I own a John Deere D130 riding mower. The mower blade belt needs adjusting but I canít find any way to do it. The bracket on the deck which holds the cable does not have adjustment screws like all the diagrams and videos show. The bracket on my mower deck is welded solid. Even the diagram in my operatorís manual shows a picture of the bracket with no screws. The manual mentions the possible need for belt adjustment, but doesnít say how. Can anyone help?