SINGER W1710 - Manual (Page 41)

i6. TWIN NEEDLE THREADING
Thread in the same way as normal threading,
except at points (D, (|) 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 1 5 IR"\
o i I I \ \ j } .
When using twin needle sewing be sure zigzag
width control setting between 0 and 2.5, and
needle position control at r~Tl . If zigzag width
control above 2.5 or needle position control
at («
) , ( 5) this will cause needle break.