Kenmore 384.18024000 Owner's Manual page 72

If the button is extremely thick, make a test buttonhole.
If it is difficult to fit the button through the test buttonhole,
lengthen the buttonhole by pulling the button holder on the
foot back to increase the length.
(_ Gap
How to Adjust Buttonhole Stitch Density
Use the stitch length control _ to adjust stitch density.
Turn the dial in direction (_ for a coarser density (_.
Turn the dial in direction (_ for a tighter density _.
J
71