Since the tank area was opened I spray some oil to fight rust and mice.
Here is the new upper ball joint...
I've used a hand made starter tool to extract the ball joint seat. The diameter and thread of the tool to extract the seat is 12mm x 1.0; I've used 12 x 1.25 which did not matter since the seat is good for the garbage anyway.
Since I was lubing the ball joints, I did 15 pumps on the drive shaft.