Loosen the needle clamp screw by turning it counterclockwise.
Correct upper threading is vital. Incorrect routing causes instantly jammed threads, looping, or snapped needles. Raise the presser foot lifter to open the tension discs. victoria 537 manual
Push the bobbin onto the bobbin winder spindle, aligning the small pin on the spindle with the notch in the bobbin. Loosen the needle clamp screw by turning it counterclockwise