SINGER W311 - Manual (Page 6)

Correct winding Incorrect winding
In order to ensure smooth rotation of the bobbin within its
case, make sure that the thread is wound evenly on the bobbin,
otherwise it may cause thread to break, irregular tension, or
fail to produce neat stitches.
ADJUSTING TO WIND ON THE BOBBIN
« í ■
SETTING THE NEEDLE
Turn the balance wheel toward you until the needle bar rea­
ches its highest position.
Loosen the needle clamp screw.
insert the needle with the flat side toward the balance wheel
and push the needle up into the needle clamp until it hits the
stop.
Tighten the neecie "lamp securely.