Indenting text framed by a vertical rule

I would like to know how to modify the LaTeX based answer to this question so that the text left margin would be increased by a given amount. I've tried to change the value of `\leftmargin`, `\evensidemargin`, `\oddsidemargin`, `\textwidth`, etc. to no effect. I can change the text right margin by adjusting `\hsize` ... but that does not help me as I can't find out how to shift the whole thing left. I've also tried to use the `changepage` package but without success.

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Did yout try `\leftskip`? –  Stephan Lehmke Mar 23 '12 at 14:11
I had not. :-( That seems to work nicely for the text. It does mess up the bottom line but I should be able to figure it out. Could you change your comment to an answer so that I can accept it as the correct one? –  André Mar 23 '12 at 14:16

Try setting `\leftskip` (untested).