Having an 85 740, wipers started to wobble over the yrs. I figured age, linkage getting sloppy, elongated holes, etc. Decided to get some junk parts and fix the linkage. While looking at the Haynes manual, showed a pic of "cable adjusting nut" with no explanation. Removed the entire assembly and found the nut. Grabbing the frame the cable rides on, it would twist/move. Cable end has a flathead slot, so held the nut and tighteded the cable couple turns until the frame would not move/twist. Replaced and like new. So if you think everything is wore out, try this first.