My 4S camera has a black rubber isolator between the portion of the logic board that runs across the top of the phone and the camera body. It was covered by a black tape piece that covers the little prong that is secured between the logic board and that mounting screw. I replaced my logic board and this thing fell out. I am not certain I have it replaced properly, but the camera does not move at all and is lined up correctly, so it does fit the space. It is a C channel that fits over the edge of the logic board. I think only some phones have this. I do not see it in *any* of the various 4S guides. If it is in there it is probably important. If you remove your camera be CAREFUL to note whether you have this .25” long 2mm thick black rubber bit. If you do, CAREFULLY inspect its orientation so you can replace it if you knock it loose. Everything still works perfectly, so at least it seems I did no harm in placing it where I did.

Um, how about finishing this?

The trackpad sold to me by ifixit did not come with the little hinge plates. I had to remove the six other screws and transfer these to the new trackpad. If this is based on using the part as sold here then the photo needs to be corrected to show the six red circles on the phillips screws that are on the trackpad and not on the Mac itself. These are installed quite tightly and I nearly destroyed two of them (on the body side as indicated in the photo) using the correct tool. The six that screw into the trackpad are much more gently installed. I don't think you are generally supposed to remove the six to the chassis of the MBA. Please update this to correct this - UNLESS THE PART FROM APPLE INCLUDES THESE TWO HINGE PLATES AND SCREWS. In that case, please INDICATE THIS difference in the text of the article. It added work and a bit of stress when the two screws were nearly trashed and I realized the new part did not come with replacements. Not good. However, this was otherwise a very easy project. THANKS!