Jim, I have an early 1222, that wasn't sewing straight. I did a bunch of research about the machine. I got it to sew straight, but had to time it. It sewed okay for a bit, but then it went out again. From my understanding there is a plastic cam that has a tendency to crack. There are replacements available for a $$. From my understanding the cam doesn't come with a shaft and so would need to keep the old one. I didn't find how to replace it. I think there are some other plastic bits that tend to crack, too. If it is just the top one, I have heard that you can remove it and still be able to stitch straight stitch and zigzag.
Those that have 1222s in working order are happy with them.
Janey - Neat people never make the exciting discoveries I do.