By the power of the Ever living one I resurrect this post... (back ground music pipes up ' Hear the thunder hear the roar the Thunder Cats are loose... ) With some good news I found the Grudge Ball rules Mortis and the gang have been look for.
They can bee found here:
http://www.irregular-magazine.com/back-issues/ As an article on pages 22 - 25 of issue 8 the spring '11 edition PDF download, or zip file download.
Just right click and save target as.. or save to.. where ever you download stuff to on your computer of electronic device.
You can also open the issues in browser by clicking on the issue from the quick links.
If for some reason you can't download it let me know and I will upload the issues for file sharing and provide the link.
Updated on 31.8.2014 - I correct the link it now goes to the back issues page again.