Thank you very much everybody!
Yeah katzelmacher, you're right! I forgot to try the obvious things...

But it's always like this. I agonize for weeks over one level, then I decide to post, and after a while I get the right answer, also without reading the following thread-replies... It's a marvel!

Okay, got a second pic now, let's see...
EditWow, a third pic! I think I'm finally on the right track...
Edit 2Yeah! Got it! Thanks to T-Sam and katzelmacher for pushing me back into the right direction!
