My featherweight would not take up the bobbin thread and the top thread kept getting wound around the back of the bobbin. I started researching on the QB and web as to how to take it apart. As I started to examine the parts of my bobbin base, I found that the little "thingy" that fits up where the needle comes down is broken off! I think you can see in the picture where it is broken off.
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I found one on eBay for (just the base) for $39.00. One site wanted $238.00 for the whole thing. Glad I just found the base!