This is a part that every quilter needs to have a spare of. They can break because the thread wears a groove in them, but also they sometimes break for no apparent reason. Ask about the full Check Spring Assembly, you don’t have to guess about how much tension should the spring be providing, or wonder whether you got it re-assembled correctly. This fits ALL Gammill models.
For those who are familiar with rebuilding their own check spring assembly OR to whom time is not of the essence, it is less expensive to rebuild your own check spring assembly. IF YOUR MACHINE ABSOLUTELY NEEDS TO WORK then you should order the entire assembly, not just the spring, as the entire assembly comes factory pre-set to work properly without tweaking.