Singer 6038 Manuel D'instructions page 72

Buttons are easily and quickly attached, with straight
stitching and simple zigzag stitching.
RECOMMENDED INITIAL SETTINGS
Pattern: Straight stitch and zig-zag stitch
Needle position: Left
Stitch width: Adjustable
Foot: Buttonsewing presser foot
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. Drop feed (page 26) moving the lever to the left. Set
machine for straight stitching.
. Raise the bobbin thread and pull both threads to the
back of the presser foot (illustration 1).
. Place the fabric and button under the presser foot.
Turn hand wheel toward your direction observing if
needle enters the center of the left hole of the
button (illustration 2). Adjust fabric and button if
necessary.
. Lower the presser foot and take a couple of stitches.
Bring the needle up out of the button.