SINGER 1120 - Manual (Page 19)

Hold the upper thread with the left hand. Turn the handwheel
(1) towards you (counterclockwise) lowering, then raising
needle.
Gently pull on the upper thread to bring the bobbin thread up
through the needle plate hole (2). Lay both threads to the back
under the presser foot. (3)
1
2 3
16
Raising the bobbin thread