zigzag vertical lines

[Jean-marc LEGRAND]

Hi list !

I've tried this with lily 2.0 :

\score      {

      \notes
      \relative c''     {

            \property Voice.Line \override #'style = #'zigzag
            a-"\\embeddedps{0.1 setlinewidth -1 7 moveto 0 -3 rlineto stroke}"
                  }

      \paper { linewidth = 70 * \staffspace
%     raggedright = ##t
      }
}


I try to give at the vertical line a zigzag shape.
Does anybody know what I have to do ?

Thanks