Multipurpose Calcium Sulphonate Complex Grease, NLGI 1.5
You'll want to verify that whatever you get is compatible, unless you are completely cleaning the case and replacing.
http://www.adhisegarasemesta.com/upload ... 0chart.jpgThe lithium complex is probably your easiest "off the shelf" type stuff you're going to find. Not necessarily the most waterproof, but better than no grease. The NLGI 1.5 may not be that easy to find either, but I'm guessing they spec it that light so it will move around some in there, so don't cheat there.