Several times I have referenced a lens/camera support that I use for the Nikkor telephotos -- 600mm and 800mm. It works very well and I thought maybe someone else would get some use from this idea. The pictures are below.

The camera I use is a Deardorff 57. This little support is made from common aluminum that you could find at the hardware store. It is pop-rivetted together. The slot is such that it slides between the camera and the tripod head. The little wooden block on the end is just the right height to support the front of the Deardorff. It is not attached to the camera except by gravity. As the Deardorff focuses in the rear, the front support can be minimal and need not move. I suppose if you didn't have a rear focus, you could make a longer support in the front with a slippery surface on which the front standard might rest. The support weighs 200 gr.