Some have had success by filling the rubber bushings with silicone to stiffen up the bushings (there's a discussion on rennlist). This didn't work for me, so I just got a new frame for $60:
http://www.****************************************************.com/product/airbagframe.html?Category_Code=POTEBXCC
Relatively inexpensive, you know it will work the first time, & you don't have to wait for the silicone to dry.