I tried the ball seat with the extra steel part up, as shown in the Truck Factory Assembly Manual, and it leaked. Tried it with the extra steel part down and it leaked just the same. I have an extra ball seat and actually made a gasket to fit the ball seat with extra steel section to put between the seat and extension housing. Will try it this weekend. At this point I could probably live with a drip once in awhile. Everything you keep sending me is great info.