HT4882 This no longer seems to work since Lion was installed and still not with Mountain Lion.

It seems this feature has stopped working only since Lion (now Mountain Lion)was installed. I wil try an old copy of an earlier OS as an external boot to check but this appears to be anOS upgrade problem.

The Swedish site you've linked is discussing .xmodmap, which is a hidden (hidden because of that leading dot) configuration file in your login home directory that's used to customize settings for the keyboard mapping within X11.
I'd expect the XQuartz tool to read ~/.xmodmap in your login directory as part of its initialization sequence.
The xmodmap tool (no leading dot, and not a hidden file) is an application that's used to process the configuration file.
When you invoke xmodmap (the tool), you either need to specify the full path /usr/X11/bin/xmodmap for it to be found and invoked, or you need to have the /usr/X11/bin/ directory added to your PATH.  Your PATH is the list of directories where OS X looks for the tools you're invoking. 
If the xmodmap tool is not working, are there any diagnostics?  Or is XQuartz not honoring the request?  (If so, see if it will honor the setting made via the .xmodmap configuration file.)
And if you don't get an answer here, you might try the (pretty quiet) Apple x11-users mailing list.

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