lesbentley - I did try that - took the end values form a properly conformed head bone and replaced the line in the later version after I added children and it did not seam to have any effect...

Every tutorial I found so far just uses the V4 Dev Foundation instead of making fresh bones for conforming, but it seams a bit unpractical - I need only one bone after all :( Dev Foundation has the correctly set up bones, so it should be doable in Poser no?
I think I'm missing something.