key signature spacing

[Martin Bergande]

Can anyone tell me how to assign the distance beween
the natural signs in the follwing example:

\version "2.10.5"
\score {
  \new PianoStaff 
  <<    
    \new Staff = "right"
    {
      \clef treble
      \key b \major
      fis' gis' ais' b'
    }
    \new Staff = "left" 
    {
      \clef bass
      \set Staff.keySignature = 
      #'((5 . 0) (1 . 0) (4 . 0) (0 . 0) (3 . 0))
      c d e f
    }
 >>
}

Thank you in advance,

Martin
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