Don't define the page lay-out here -- rely on A4wide, doubleside options.

Doc/myformat.sty

@@ -1,17 +1,8 @@
-% Style parameters and macros used by some documents here
+% Style parameters and macros used by most documents here
 
-% Page format parameters for A4 (European standard paper size)
-%\textwidth =      160mm
-%\textheight =     240mm
-%\topmargin =      -11mm
-
-% Page format parameters for U.S. standard paper size
-\textwidth =      160mm
-\textheight =     220mm
-\topmargin =      -11mm
-
-\oddsidemargin =   1.5mm
-\evensidemargin =  1.5mm
+% This has to be tuned each time the repair person takes the printer apart:
+\addtolength{\oddsidemargin}{-2.5mm}
+\addtolength{\evensidemargin}{-2.5mm}
 
 % Style parameters
 \raggedbottom