The hinge pin on the nose door... I've seen lots of ways to do them - a rivet or a very short nail through the hole to replace a missing pin. I've seen the hinge hole broken - BIL used the JB Weld to hold one on - it looks just fine. The top doors are another story. When they go they are gone unless you can find a donor. I don't think there would be much way to improvise one of them. They are big and heavy and clumsy on those machines. I think I would be inclined to take it off and park it in a drawer unless I was going to show it off... They are very cool machines. I like the way you can see with out straining your neck - that needle is positioned closer to the front than most machines. I have real gripes with some of the newer machines and their bulk - I got rid of my Janome for that very reason - it was hurting my neck and shoulders to see to sew. I think I judge a machine on whether or not I can see the needle easily or if I have to duck my head.