For some reason, I got a year's subscription to Hot Bike magazine. It's mostly for Harleys and metric cruisers. I was looking through my motorcycle magazines and was going to recycle these. I looked at the tech articles and found one about improving the Harley's handling. It's made by True Track and goes under the chassis to prevent wobble.
If you're interested, go to their website
http://www.true-track.com/index.html and click on the How-to links. Hot Bike said the true-Track was of high quality, easy to install, fits many models, improved handling, and only took about 20 minutes to install.