I replaced the support knob this afternoon and the whole process went pretty well following the instructions in the service guide. There were however two "gotchas" that I'd like point out in case anyone decides to do the same. First, be prepared to spend a little time figuring out how to remove the Middle Covers over the center rotating hinge. The pictures in the manual aren't too clear and the covers are held together by some plastic tabs that would be easy to break off if you aren't careful. There is also an omission in the steps describing the removal of the LCD Module if you have a WiFi card: Before you try to remove the LCD module you should disconnect the antenna cables from the WiFi card so they can come off with the LCD module when you disconnect it.