Remove the plungers by pressing on the sides of them with something like a small screwdriver. This squeezes them together enough for the bump on the side to fit up out through the hole the plunger is in.

The metal pins will then come out. Be careful not to lose the springs behind those pins.

Now you get to lubricate the metal pins. Mine were originally covered with a dry lubricant. I can tell by how black my hands were afterwards. Oh, did I forget to tell you to wear rubber gloves?

Since I had no dry lubricant on hand, I just applied some grease to the angled flats, and the bottoms of the pins.