iPhone 4S Screen
MacBook Unibody Model A1342 Trackpad
When reassembling I found the screwhole for the longer screw (on the right) was full of glue. I used a hot pin to get the worst of it out.
If you're replacing the rear panel you need to remove two small metal dowels that guide the logic board into place. They're quite tricky to remove and even trickier to put into the new rear panel. I used some thin-nosed pliers.