I managed to loose the socket of the green screw. Apparently, during my second disassembly of my iPhone the socket (which appears to be screwed in as well) came loose without me noticiing it and promptly vanished later on in the process, never to be seen again. The iPhone does seem to work without it, but still, I’d advise checking that they are still in place when you unmount the metal shield.
I managed to loose the socket of the green screw. Apparently, during my second disassembly of my iPhone the socket (which appears to be screwed in as well) came loose without me noticiing it and promptly vanished later on in the process, never to be seen again. The iPhone does seem to work without it, but still, I’d advise checking that they are still in place when you unmount the metal shield.