I picked up a nice example of a vintage Apple Extended Keyboard II. No yellowing, looks very nice, but the key movement feels a little gritty, not smooth. Is there a good fix for this?

From my understanding, this has the same style keyswitches as my old Apple IIGS keyboard had, and that one felt smooth, granted it's been around 17-years since I sold my IIGS so my memory of how its keyboard felt may be a bit hazy.