Bob,
Sorry--- I thought I would help with a photo because you said you have problems with it and it sounded by the description like the one I have. Did not want to steal your thunder! It will help if you could take a photo of the mark that you describe - the guys on the forum will tell you quickly what you want to know. Try a little chalk on the mark - it shows well on a photo and can be removed with a soft brush.
Klaus thanks for the additional info - I live in South Africa.
Piet
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