Step 5 Lock Bobbin Case Singer 401. Documenting how to replace the bobbin case of Singer 401. I had a hard time understanding the instructions to put it back in place. I figured out you have to keep take up lever at the highest position for the black metal part (the bobbin holder) to snap to lock or unlock the bobbin case. Then you have to make sure that the bobbin case fits perfectly by following the natural shapes between bobbin case and bobbin holder.
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