nomenclature indentation -how to

[Wolfgang Engelmann]

I use this in the latex preamble of the document settings of lyx for the 
nomenclature items to be displayed in two columns, to have the symbols 
in bold, and to indent the descriptions. I would liek to reduce the 
indentation in order to get more space for the text. Unfortunately I 
don't know were in the latex preamble below it is done. Can somebody 
help me?
Wolfgang

% Two column nomenclature ========================
\usepackage{multicol}
\makeatletter
\@ifundefined{chapter}
{\def\wilh at nomsection{section}}
{\def\wilh at nomsection{chapter}}
\def\thenomenclature{%
\begin{multicols}{2}[%
\csname\wilh at nomsection\endcsname*{\nomname}
\if at intoc\addcontentsline{toc}{\wilh at nomsection}{\nomname}\fi
\nompreamble]
\list{}{%
\labelwidth\nom at tempdim
\leftmargin\labelwidth
\advance\leftmargin\labelsep
\itemsep\nomitemsep
\let\makelabel\nomlabel}%
}
\def\endthenomenclature{%
\endlist
\end{multicols}
\nompostamble}
\makeatother
% Two column nomenclature ========================