Hey and thanks again dingo. I have seen a build of a double action rod. The builder simply bent a rod almost in half and inserted a plate on the threaded longer leg. The shorter leg fitted into a hole drilled halfway through the same plate above the longer one. This looks do able. So the relief I should build in you speak of means to fit the neck with a couple mm backward bend to compensate for initial string tension. Won't that make the action very low at the heel.