it came from advance...i had to help the parts guy find it in the computer. the other parts "professional" had never seen one before either. the "destructions" only listed what parts of the plunger to remove for the vehicle application. I understand the basic concept. the adjustment screw does not "bottom" out. it turns 2 full turns then "clicks" as if it sits on a spring.. im not sure which way is for firmness and which way is for softness. moving the set screw in all the way in till right before it clicks is soft, or all the way "out" for full firmness. suggestions?