Wade have you tried the actual Dubuque Clamp works brand?
http://www.thebestthings.com/newtools/uniclamps.htm and also sold through Lee Valley, Tools for Working Wood, and Woodcraft
http://www.thonline.com/news/busines...8a63cff52.html
This modification works wonders, but I found out about the original Dubuqe Clamp Works/Universal Bar Clamp brand when Lee Valley started selling them and haven't looked back ever since. I called and spoke to the guy in the article who owns the company and he said as soon as his patent ran out, the Chinese companies came in and started copying his design with "crappy material" and "thin walled" aluminum. These clamps are not terribly more expensive, either.
The original clamp is DRASTICALLY better, even Paul Sellers feels the same way as me about these original Dubuque clamp works/Universal Bar clamp design, then anything out there (Rockler brand, PeachTree Woodworking brand, Harbor Freight, etc), however, if you can't afford to pay for these, Marty did an excellent job in this video.