Thread Unwinder, Singer #505656-005 : Sewing Parts Online

Guaranteed to fit Singer Sewing Machine Models:105-8, 105-9, 111W115, 111W152, 291U1, 291U3, 331K1 Alternate Part Numbers: 225258

Understanding Thread Tension on Your Sewing Machine

Singer Thread Guides – Central Michigan Sewing Supplies Inc.

Why won't my Singer heavy duty sewing machine sew? I have checked the tension, the timing, rethreaded it, and cleaned it. It's a brand new machine. What can I do? - Quora

The #1 Singer Sewing Machine Parts Store on the Web

Thread Take-Up Spring (Pull-Up), Singer #66774 : Sewing Parts Online

Singer 99 Sewing Machine Thread Take Up Lever Assembly Simanco 33638 33635

Singer 99 99K Sewing Machine Slack Thread Regulator Simanco Part

Cutex Thread Tension Check Spring for Singer Sewing Machines #52394-6 Pack

Thread Unwinder, Singer #410389 : Sewing Parts Online

Singer 500 503 Rocketeer Sewing Machine Fold Down Spool Pin 172509

Singer SEWING MACHINE Model: 4166 REPLACEMENT PARTS

Our advantage Lightweight and compact case with considerable capacity, with can hold 63 slots bobbins to meet daily needs. High material bobbin storage with water-resistant and dustproof function, prolongs bobbins' life cycle. Well-designed spools organizer with foam, bobbin holes are surrounded by foam so your thread will stay wound and no need to get a thread-clip. Hold the bobbins securely so the threads dont tangle. The bobbin is still easy to pick up from the box.

63 Slot Bobbins Organizer Case, Sewing Thread Spools Organizer for Brother for Singer Sewing Machine-Box Only, Size: One size, Black

Help part 2: Changed bobbin to right bobbin and it still doesn't work : r/sewhelp