Singer Quantumlock 14T957DC - Threading Brown Chain Stitch Looper

Tugging slightly on the thread tail at the back of the serger, push threader lever
all the way up to hook thread into the eye at the back of the looper.
Threading Brown Chain Stitch Looper:
Top Cover Thread Guide
Thread the top cover thread guide by slipping the thread under the guide from
right to left, and then pull the thread under the small round disk from the right
side.