SINGER W1810 - Manual (Page 43)

26. TWIN NEEDLE THREADING
Thread in the same way as normal threading,
except at points ®, ® and ®.
At point®, pass threads separatly to right and
left of tension disc.
At guide®, pass one of threads to right guide
and the other at left guide.
At point®, thread from right guide should be
lead to right needle eye, and from left guide to
left needle eye.
Leave ends of threads of about 15 cm (6").
When using twin needle sewing be sure zigzag
width control setting between 0 and 2.5, and
needle position control at . If zigzag width
control above 2.5 or needle position control
SZZ) r C ») this will cause needle break.