This is not going to get rid of all camera shake but can reduce it significantly as the mass of the camera-stabiliser is increased. More force is required to move it and the smaller forces in camera shake are dampened. Also for the same reason this will allow panning motions to appear smoother.
This cost me nothing because I had the bits lying around, but the piece of metal I bent was from a shelf I purchased from Ikea a few years ago. Turns out they still sell it, over here: http://www.ikea.com/gb/en/catalog/products/10011017/ and cost 10 pounds in the UK. I guess 10 pounds is a lot different from free, but comparing that to what a glide camera stabilizers starting at about 60 pounds, this seems to be worth the try. This system doesn't have a gimbal, but never-the-less it does work.
Step 1: Bend the metal piece
The top flat bit should be made a level as possible but you can make a few adjustments a bit later if you need.