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Here we're tightening the universal-joint coupling at the steering rack. The splines make a very positive connection and only one set screw is required at this juncture. A channel to receive the set screw is manufactured into the input shaft, so it's just a matter of firmly seating the screw and then turning down the jam nut. You may wish to use a thread locking compound such as red Loctite on the set screws.