@noromance
Yes I was getting concerned that a belt drive could put the kibosh on the 401!
Now in-between sides I had a good look at the Scheu stylus under the magnifying glass and......
It has a good coating of crud which as I have been using ME fairly regularly is perplexing.
Unless it is buildup from the Lyra SPT treatment I have been using?
Course the question is how best to clean it if ME won't touch it?