I pieced it back together with super glue, and it seems to hold up fine. It will never be one of those high priced gems of accessories but I think it will last and do the job equally as well as any undamaged item. Super glue can easily get a bit messy because it's very liquid, thin like water. I might try and go over with some acetone to clean up around the joint.
This is my second swiss zigzagger, and came with a manual, a box four out of originally five cams and the feed dog cover plate. My other zigzagger is identical, but came with ten cams, missing a manual but otherwise no difference.
The Swiss zigzagger works well, if you depen on your old straight stitcher it's worth seeking one out, they turn up now and then. It's one of the best even feed attachments for the old straight stitchers, and that's probably its' main advantage for those who use it. I will likely keep my eye out for these until I have a complete set in pristine condition.