Thanks for the feed back, we removed the entire feeding system before we knew about the two screws you showed in your picture. Was a real pain to get the feed system nuts back in place, but we learned a lot. We could not get the heater out of the hole in the hot end and could not remove the thermistor. We did remove the set screw before trying to remove the heater. So we are going tighten the hot end onto the cold end, slide it back in place and see if it works. Not much else we can do. The silicon black cover that goes over the hot end is a little beat up, but I think we can slip it back on and we'd should be ok. Thank again for you help.