Singer Professional Buttonholer for Vertical Needle

 If you have a low shank (vertical needle) zigzag sewing machine of ANY brand, you might consider one of these.

Singer Professional Buttonhole for Vertical Needle zigzag machines

While this is similar to the Singer Automatic Buttonholer for straight stitch, this one works with ZIGZAG machines.  Rather than the attachment moving the fabric back and forth to create the zigzag stitch, the Professional Buttonholer is a smoother operation.

This is the Automatic Buttonholer - it moves the fabric back and forth to make the zigzag stitch

Here is the Professional Buttonholer on a Singer Genie.  Notice that it uses the machine's zigzag, so there is much less movement of the fabric.

Super nice buttonholes, second to none. This one on a Singer 319

The set even includes the eyelet cam - almost impossible to find for the Automatic Buttonholer because it was sold separately