Thank you all for your private work!
I wanted to clarify that my S&B is the 2010 is part of a batch of four telescopes ordered by me and other friends. My think the 4 is what suffers less temperature variations (in addition since I acted on the diopter adjustment has improved a lot and is highest within 2m) 2 other hand seem to experience more changes in temperature and also differnce 5m over long distances.
I also noticed an improvement Pepone adjusting diopter, so I think that "even if avebbe meaning" servant of something.
Home About S&B are really disappointed, I call more than 10 emails and still have not given me an answer! what a shame!