Is this correct for swapping Master Cylinder from single to dual?

Are you saying the spring is not needed? It does feel like when I push brake it takes too far before braking begins. And as I let it up I can feel toward the end, that something changes and the pedal keeps coming up. Is it possible that this spring is pushing the pedal too hi? It is a major issue for me. I've even ordered another MC to see if it is any different. Do the adjustable rods all fit this type of MC? Any links would be greatly appreciated.