Loose lens on Canonet

I have a QL17GIII and the whole lens+shutter assembly can be wiggled up and down. I have no idea what this is doing to my focus accuracy. I was hoping that there would be a simple retaining ring inside the camera that I could tighten up but I don't see any way to tighten the lens assembly. Is there anything I can do?

Google is your friend:

http://www.kyphoto.com/classics/forum/messages/6899/6468.html?1147614208

A tiny bit of wiggle seems quite common on the Canonet. Many people have commented on it before. My Canonet has a tiny bit of wiggle. It has no affect on focus accuracy.