SINGER 850SCH SCHOLASTIC COMBO - Manual (Page 34)

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The needle position can be altered with the "Three needle
position dial". For normal work, the needle position in the middle.
For edge stitching or sewing parallel lines of topstitching, select
needle position left or right. For twin needle stitching, needle
position is middle.
In order to set the Three Needle Position Dial (See item # 9 on
page 2 of the manual) to the left, in the center or to the right, the
Stitch Width Dial must be set to "0" position.
a. Straight
b. Zig-zag
L. Left Needle Position
M. Middle Needle Position
R. Right Needle Position
Three Needle Position Dial EN
L M R
a
b