SINGER 14T967DC-WORKBOOK QUANTUMLOCK - Manual (Page 172)

Thread Right Overedge needle with regualar overlock thread.
1. Raise the Presser Foot to release the tension disks. Thread the right
needle as illustrated 1-9.
2. Pass thread from back to the front
through the thread guide .
3. Thread the top cover thread guide by pulling the thread towards the left until
it slips under the guide. Then pull the thread along the right side of the
button as illustrated.
4. Continue to thread points 4-8. Slip the thread into the rear slot of the
thread guide . Go over the take up lever . Continue by slipping the
thread into the right slot of the thread guides and .
Five-Thread Safety Stitch Narrow page 13