Singer 20u Instruction Manual page 39

Page5 T H R E A D I N G THE N E E D L E
1. Turn hand wheel toward you to raise take-up lever to
its highest position.
2. Raise the presser foot.
3. Lead thread from the thread unwinder through all the
threading points shown. Thread the needle from front
to back.
4. Draw about 3 inches of thread through eye of needle.
Insert for 20U31, 33
Form U3990