SINGER 4423 Heavy Duty - Manual (Page 47)

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Left and Right Side Balance for Buttonhole
Stitch density on right and left sides of buttonhole can be
adjusted by buttonhole balance control dial.
This dial should usually be in a neutral position (between "+"
and " ")
If the stitches on the left side of buttonhole are too close
together, turn the dial to the left (+).
* Turning dial to the left opens left side.
If the stitches on the left side of the buttonhole are too open,
turn the dial to the right ( ).
* Turning dial to right closes left side.
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