Ok I looked back up there - I doubt if it has a broken gear. If the clutch is engaged and it doesn't turn there no doubt is some dried up oil in a shaft somewhere. It can take time for the oil to work it's way into the shaft and get it to free up. Sometimes heat helps move the oil into the cracks. I'm thinking judging by the body look of the machine that it was made by Brother. Some times you can tell by the stampings under the machine. You might be able to get an owner's manual by contacting Brother hhmmm maybe it was Janome... Anyway some times you can get manuals from the manufacture.