I am not sure what some would call the proper fix, but there are several possibilities. I have had play either in the steering shaft/housing area and simply adding a thin washer as a spacer fixed 'em up. I have added exterior washers to tighten the worm gear shaft. I have had the beveled gear shaft machined to accept larger keys. The best and simplest fix was one I heard at an IH dealership about 30 years ago. I asked the parts guy it here would be anything wrong with welding the beveled gear to the shaft. He said "that's how we fix 'em." It may not be "correct" but it works.