SINGER 14T968DC - Manual (Page 89)

5. 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 .
8. Before threading the eye of the needle, make sure the thread is
behind the thread guide located on the bottom of the needle clamp.
9. Draw about 4 inches of the thread through the needle eye towards the back
of the machine.
10. Place the thread to the back, under the Presser Foot.
Three-Thread Flatlock (narrow) page 13