Singer Quantumlock 14T957DC - Threading Blue Overedge Stitch Needle

Tugging slightly on the thread tail at the back of the serger, push the threader
lever all the way up to hook thread into the eye at the back of the looper.
Threading Blue Overedge Stitch Needle:
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.