I have a viking 3610 and it some how got out of time....took it to a repair shop and he said, they don't make parts for these any more and I would charge you about $100. to work on it. So I took it home and it sits in the closet, it was such a good machine. I think I keep it for sentimental reasons.
If it runs, and for $20, you could use it until it dies...