donquichotte:
I speak from personal experience when I say that In the US, Sonus Faber has an outstanding rep (Will Kline) who answers his phone and emails and is extremely knowledgeable and seems to actually enjoy providing information and assistance. If you are not in the US, then perhaps the issue is not Sonus Faber per se, but your local (country) rep. Also, my authorized dealer here seems to be able to obtain information, etc easily. I hope you can find the assistance you need.