Hi,
you could try posting your question at:
http://www.sahara-forum.de/
Go to the Sahara section.
this is a german bullitin board run by Klaus Däerr which is an authority on Trans Sahara travel (several good guides in german), and also runs an equipment shop in Munchen.
Cheers,
-Paal w w w . p a a l . s k j e t n e . c o m