I saw some posting on the subject of DIY steadicam stabilizers. I wonder if anyone would find my work of interest. I developed my own design of compact low friction gimbal in a Merlin-style stabilizer. Note - this does not use a ball joint. You can see the design on my website here
http://www.diycamera.com/stabiliser/index.html
and some video results here
http://www.youtube.com/wsclater?gl=GB&hl=en-GB
I have found there to be quite a bit of interest in my work, and many other people are copying the gimbal design.
Regards from Scotland