Brother ST4031HD Operation Manual page 26

Storage for the stitch finger <A> is provided on
the inside of the front cover.
[Product code: 884-B02]
[Product code: 884-B03]
* The product code is shown on the machine
rating plate.
NOTE:
Make sure to install stitch finger when sewing
regular overlock stitches.
4. Adjust the stitch width dial up to the "R"
position.
<A>
<A> Selection mark
24
5. Adjust the stitch length.
<A>
<A>
Set the stitch length adjustment dial to "R to 2"
position (for narrow overlock stitch: R to 2, for
rolled hemming stitch: R).
<A>
<A> Selection mark
3