knees

[Rune Zedeler]

Help!
The spacing in 1.4 is too bad, so I have to stick to 1.5 - but the 
position of knee-beams is totally off... How do I manually set position 
 of a knee-beam? (The manual is not up too date - cf. bottom of
http://lilypond.org/development/Documentation/user/out-www/lilypond/Beaming.html
)

I tried setting #'positions - but that only affects the beam and not the 
stems.

-Rune (in a hurry)