I see a lot of old oil in there. You will have lots of cleaning, new Tri-flow and patience - some little part whether a gear or a spring or what ever is gummed up. There are some machines I never know what I do to make one work just clean and oil until they work. If someone messed with it it might be more of a problem. I'm thinking Belaire was made by Brother. The Belaire machines I've seen have been nice machines. It is possible that since the part has been removed that something is out of timing.