The Sirui baseplate I got has a ring type fold down attachment you can get a bit of leverage onto to tighten it up. I use it also to attach my TEC110 when I put that on the Manfrotto tripod.
It has a rubber layer on the face that meets the camera. There are others that are similar. It is also much larger than the standard quick release plate.
http://www.mainlinephoto.com.au/category63_1.htm
There's a compete setup there for $359 and other cheaper ones but not with the mounting plate.
Greg.