Threading Your Singer 503 Sewing Machine.
Threading Instructions
1) Turn hand wheel to raise take-up lever to highest point.
2) Raise stitch chart cover and place thread on either of the two spool pins.
3) Lead thread through all threading points shown, including the thread control.
4) Thread needle from front to back.
5) Draw sufficient thread through eye of needle with which to start sewing.
The automatic thread control, located above the tension, ensures a smooth flow of thread
from spool to needle. This device eliminates spool weight and drag by pulling off a
measured amount of thread before it passes through the tension discs.
CAUTION: On Console Models, make certain that Stitch Chart is closed before lowering
machine into cabinet.
Threading Your Singer 503 Sewing Machine.
You can find the complete instruction manual here.