The control shafts that move the flaps which control the the hot/cold air and which vents the air come out have broken. The car is a 1999 93 Saab so I'm assuming that the hinges (the flap has a peg that goes through a hole) just need lubrication. (In addition to a replacement control shaft).
I can see that there's existing grease of some sort.
What should I be using? Is it something special and what is it called?