cut the botton coil off a shock spring that is slightly smaller than the C spring on the servo saver. Then cut a slight channel with a dremel aorund the c spring and wrap the cut coil from the shock spring around the C cpring.

You can see what I mean in this pic. The bright orange ring around the servo saver is actually the bottom coil off a stiff mini-t spring I had around.

http://home.comcast.net/~pewter_camaro/RC18t_10.jpg