Touch ID Issue

I replaced the screen on my iphone 5s, and struggled with the home key cable. First Im not 100% sure what direction the ground type connector on the screw should face and also I didnt realise the metal door over the cable commector was hinged I removed this. Has anyone got a good quality photon of the screw in question? How important is the metal door thing? My home key works but not the touch id now.