Join Date: Sep 2006
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Put a new key in it and it will probably get rid of some of the play. I was in this situation with the steering head flange on a worm-gear steered boat a wee while back.
If you can get the shaft out of there (not an option for me) you can cut a larger keyway in it, and in the wheel. Be careful though, unless it's on a taper, a keyway is not designed to stand alone... it needs to have a locking bolt on it, often two of them. The key and keyway really should not be able to fret. If they can fret, then the play will just worsen again.
You will have to trace the clicking noise. Get a friend to turn the wheel, and listen until you find it. It sounds like lubrication. It should not be difficult to fix.