This subject comes up often, some issues mechanically, but more often it's just salt crushed up between the bearings,. My fix is to put a small amount of oil (half a cup) down the rubber gaiter when lifted out and move the steering lock to lock for a time you will see the crud come out of the rudder stock from below.
I have put this on the site before, such an easy fix but it seems to be missed by a lot.
Hope this helps
Odysseus
Bav 38