Heinz, thanks for posting this topic. About ten years ago a mechanic of (louwman, durch dealer) noticed some play in the steering of my 2009 Roadster. He stated that the expansion of nylon follower was to blame. He carried out the mechanical treatment you described. Indeed, it fixed the “play”. On the occasion he said that he saw this regularly, so, I never thought of posting the issue and its solution. Point is that the play slowly inceases and at the time, and can therefore remain unnoticed. I thought: it is a Morgan, this is normal. Well it is not. Hence, good you made the community aware! Safety first.