[OS X TeX] changing textwidth within the document

[Sergei Mariev]

Der all,

I need to change the dimensions of the text block area within my 
document. The introduction should be 86 mm wide and the text part 
only 70 mm. I have fixed the textblock in the preamble by specifiyng 
\settypeblocksize{36\onelineskip}{8.6cm}{*}\fixpdflayout After the 
introduction I want to change the textwidth to 7cm. Just typing 
\setlength{\textwidth}{7cm} does not really work: it does change the 
length of the headings after this point, but the width of the printed 
block continues to be 86 mm. Increasing the size of the margins with 
\setlength{\evensidemargin} etc. does not have any effect either... 
What do I have to do?

The memman has an enigmatic phrase in this regard (p. 234): "It is 
possible to implement this layout [i.e. a different one -S.M.] just 
for this chapter but I'm not going to tell you either how to do it, 
or demonstrate it.

Thanks a lot!

Sergei Mariev
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