the Lucky Foot Variant Recycler found in 1.3pb3 has a mistake in the odf which I missed catching. To get the Variant to work, you'll need to download this .zip and place the contents (except the readme.txt of course) in your addon directory.
http://www.jtworld.net/mine/luckyvariantfix.zip
These files have been sent to GSH and if he decides down the line someday to release a small fixme patch for anything, these files will be included.