Singer 14T967DC Workbook page 134

10. Thread the looper eye (A) from front to back. Pull about 4 inches of thread.
Position thread into V cutout (B) on threader. Firmly hold thread tail with
left hand and pull Threader lever (C) up into place (D).
Thread Chainstitch Looper with regular overlock thread.
1. Raise the Presser Foot to release the
tension disks. Pass the thread from
the back to the front through the
thread guide
"V" cutout
.
Four-Thread Safety Stitch page 8
Threader Lever