Here's another article that I found that can help you all. Jeff showed us this tip at a Potomac River Smallmouth Clup meeting a couple years ago. Jeff "Yakfish" Little wrote this for one of my favorite bass sites
www.riversmallies.com. I use these rattles all the time. Easy to make, cheap, and they catch fish! Enjoy!
http://www.riversmallies.com/guestart_jlittle1.html