Welcome to SBO forums! Wondering how much use your Bene has seen.
My rudder has a little bit of play and I know it’s not from overuse, so I have simply monitored it for the past ten years; really hasn’t become any worse. If your problem is extreme you will have to change the rudder bearing. Search the archives here, because someone previously posted a shimming procedure to reduce excess movement, without replacing the bearings. Again, welcome aboard.