Knocking from rudder

Hi All
My rudder has A bit of play and it knocks as I turn it from side to side. Is this bearings any ideas for a cure. I have wheel steering but I assume it’s the same set up where the rudder sits as tiller steering. Appreciate your advice

If you go to archives post and trawl through them you find more information l replaced my bottom bearing with delrin a few years back now.

Ta!