Rudder questions

[Easy]

Hi All!
Well I just pulled the rudder on my 1970 Grampian 26. I found it a bit sloppy this summer, especially running downwind.
I wanted to see if there were bearings but the brass shaft runs in brass tubes top and bottom. They seem somewhat worn and I was wondering if there were thin sleeves I could slide inside to hold the shaft tighter.
I dont want to try and replace them as nothing leaks now and I fear it might later.
The brass cap is worn down about an 1/8 th of an inch and I wondered if adding a washer would help tighten things and take some play out.
Also glad that I pulled the rudder as I found it to be cracked across the top. Shaft is still tight in the rudder, so I plan to clean it up, dry it out and fill with epoxy.
Just wanted to get your thoughts on any and all this, as your opinions are very much appreciated.
Cheers, Easy Go