I do not know the command line for symbolic links. I created the symbolic link of /Centos/5 to /Centos/5.1 in Nautilus which does not have a method of changing a symbolic link. Only deleting it and creating a new one.
Is there a command line to change /Centos/5 to link to /Centos/5.2 ?
IMNSHO, anyone that has more than 2 Centos boxes should maintain their own local repo. Of course it only took me a few years until I got mine up and running! Just had some challenges walking the talk :)