I got a buttonholer! Never sewn a buttonhole before in my life (by hand or machine), very much experimenting with tension and need to experiment with thread size, but they are buttonholes! Exciting!
It came with the original instruction leaflet which was very clear - I have not used any external tutorial. There are 5 buttonhole templates (one of them is in the gizmo already) to control the length and shape of your buttonhole, and a lever on the side to control the stitch width. The leaflet has instructions for managing the thread ends neatly but I have ignored those so far. I have cut these buttonholes with a seam ripper as suggested in the instruction leaflet; a buttonhole chisel might happen some other time.
Note that machine buttonholes are a special case of the zigzag stitch, usually accomplished by moving the needle side to side. My sewing machine (made in 1955) is a singer featherweight 221k and it does not have a zigzag stitch. The buttonholer clamps down and shifts the entire fabric side to side instead, as well as moving it in an oval to go around the buttonhole.
