Thanks Mike, had a look at the link you supplied. I will try and track down Chris, he doesn't seem to have a website, but obviously knows his trade if WR are using him. I have been in touch with a company in Ferlach, but our correspondence dried up pretty quickly, the language barrier may have been an issue and they did not reply to my queries. After posting this I remembered Effebi in Italy make tubes...if anyone else is interested.