Originally Posted by Mickey2

I have the large Singer zigzagger attachment in question, the black with cams that look like red knobs (I think there is a yellow cam set, as well as a blue). I can confirm it will work on any low shank machine like the 15. It's probably not the best zigzagger made, but it has the highest number of stitch patterns. For me it hasn't been practical at all. It does zigzag, but nothing like the swing needle zigzag on my vintage Bernina or Elna Supermatic. It's hard to maneuver, particularly along edges, and it misbehaves on thinner fabrics; there is nothing like the sating stitch fine tuning you get on the 1950s Berninas and Elnas on this attachment. I rather go for the narrow Greist version, or Japanese made versions. The Swiss zigzagger cost a bit too much, but isn't impossibly expensive if you really want it.