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bobbin case ![click to hear : bobbin case click to hear : bobbin case](../../../images/speaker-vert.gif)
Case placed under the needle plate; the bobbin fits inside it.
latch lever ![click to hear : latch lever click to hear : latch lever](../../../images/speaker-vert.gif)
Mechanism that the bobbin fits into and that regulates lower thread tension.
hook ![click to hear : hook click to hear : hook](../../../images/speaker-vert.gif)
Fixed lower component containing the latch lever.
bobbin ![click to hear : bobbin click to hear : bobbin](../../../images/speaker-vert.gif)
Spool on which the lower thread is wound.