Originally Posted by Compulsive Quilter
Here's a picture of a foot that came with my Viking Quilt Designer 1.
Originally Posted by Nana2Sew
It is a "Sensor One-Step Buttonhole Foot". It works great for making a number of buttonholes exactly the same size.
That foot came with my Viking 870 Quilt. I thought it was strange that a "quilt" machine came with a buttonhole foot but not a walking or free motion hopping foot. I've never used the buttonhole foot.