When you turn the steering wheel and watch the drag link it is loose on both ends.
That's why the plug is threaded. Turn it in until it's tight, then back off a little. As long as the two halves of the coupling aren't worn to the point they butt together, just take out the slack, after doing a thorough cleanup and inspection. All the pieces are replaceable, as well, even the ball at both ends, although changing the balls involves some sweat and cusswords. A good master mechanic should be able to use profanity in at least three languages for fifteen minutes without repeating himself.
NAPA drag link repair kit:
http://i.ebayimg.com/images/g/gpsAAOSw5VFWN4Wq/s-l400.jpgJerry
