I'm talking about the spring that is acting to level the head when the friction knob is loosened. It seems that on this fluid head the spring tension cannot be adjusted. If I'm not mistaken, normally one can balance the rig on the head by sliding the plate back and forth. But since you replaced the bridge by the Kirk bridge with a fixed clamp, the spring tension might get in the way when one is trying to put the head at an angle and intends it to stay there. I think one can open up the head and remove the spring. How do you deal with this?