Now i found the motor documentation on the model 660 wich seems the same at http://documatheque.galet.free.fr/index.php?cat=24
The exploded pictures are very clear, now i get a grip on how it should be put together.

Thanks for the god hint Joan!
The stainless TIG rods are more of use making spokes and beams than to weld with *S* That´s where the half of the rods we buy goes...
Melting down the tip with the TIG would form the cone-like thing at the end of the spoke, i´ll try that.