Thank guys. If you're wondering about that one black screw head - well I think those engineers meant for it to not come out. The screw head was pinched. Probably to prevent someone like me from loosening the core up to much and having all the laminated plates come apart
Any ideas about the video and audio being out of whack? Several other sets seem to suffer from the same problem. Maybe it an alignment issue or maybe my converter box is driving it too hard? I'll try my BT agile modulator tomorrow.