is this one in the photo.
I have 2 of them and used them aboard for over 4 years. Used both still cameras and video cameras. They hold tight and work very well. It is soft and has cork on the clamp part.
You can see them at:
http://www.saferacer.com/chase-cam-universal-clamp-camera-mount.html?productid=1821
or
http://www.ambientweather.com/stsemntclamp.html

Greg
P.S. Standard disclaimer, no connection to them.