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Not sure if this applies to Model As or not, but my 1965 Ford Truck shop manual says: "Tighten the threaded plug in the end of the socket until the spring is fully compressed (ball seat bottoms on spring seat). Then back off the plug approximately 1 turn to the point where the slot in the plug lines up with the cotter pin holes in the drag link. Install a new cotter pin through the end of the drag link to lock the plug.