I have seen two different adjusting bolts, one with a gear type affair, only in pics. I have utilized the threaded "L" bolt on a few occasions. (both of my current cars) Most are bent some, and very expensive to replace, or have the proper bolt and threaded rod welded. If all else fails, just do as DieselDog suggests, and wedge apart and tighten one of 'em down.

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83 SD

84 CD