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bobbin case click to hear : bobbin case

Case placed under the needle plate; the bobbin fits inside it.
bobbin case image
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See bobbin case in : french | spanish
latch lever hook bobbin

latch lever click to hear : latch lever

Mechanism that the bobbin fits into and that regulates lower thread tension.

hook click to hear : hook

Fixed lower component containing the latch lever.

bobbin click to hear : bobbin

Spool on which the lower thread is wound.