Rudder bush dropped

If it were me I would put a bead of epoxy under the top hat/on top of the rudder blade. That would physically prevent it from dropping.
 
The bearing on mine is held in place with a set screw.

When I wanted to increase the gap between the rudder and the skeg I used a B&Q nylon tap washer which I split across on one side and wiggled into the gap. It's been there 4 years showing no wear. Perhaps that would work here.
 
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