Conclusion: The 676G is the "everyman's" vintage machine—less complex than the 401A but more powerful than a basic 237.
| Problem | Likely Cause | Solution | |---------|--------------|----------| | Skipped stitches | Dull/bent needle | Replace needle (size 70/10–90/14) | | Upper thread breaks | Incorrect threading or burrs | Rethread; check needle eye and plate | | Bobbin thread loops on top | Incorrect bobbin tension | Adjust small screw on bobbin case (1/8 turn) | | Machine jams | Lint in hook area | Clean with brush; oil according to manual | | Fabric not feeding | Feed dogs lowered | Check feed dog drop lever (if present) | | No zigzag | Pattern dial not fully engaged | Turn dial firmly until it clicks | singer 676g