there are a couple of fixes in the tech section
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1186192038/12#12but, there are a couple of places the rattle comes from, wiring and the aiming assembly. some shove rags in behind the bulb inside the housing. but I would be concerned about them getting too hot and providing a different kind of... "light"
I shoved rubber tubing around the aiming assembly inbetween the outer frame and the inner.