No Back Lash Spring with felt pad.
- Works with most spools of thread and eliminates back lash.
- Can be used with metal or plastic spool pins.
- Will work with spool pins that have a 4 mm diameter up to 4.7 mm diameter.
- Spool pin not included.
Fits Singer models: 15, 66, 27, 28, 99, 101, 201, 221, 222m most Singer 15 clones.