Knob Shaft (Drives the Actual Screw) for Brother, Baby Lock Hoop # XC8121051 (Thumb Screw)
Genuine Brother replacement part. Number 105 in the secondary picture (all of the other items are shown for reference-only and are not included).
For use with Brother hoops: SA437, SA438, SA439, SA440, SA441, SA446, SA447, SA448, XF9309001, and others.
For use with Baby Lock hoops: BLMA-150, EF73, EF74, EF75, EF76, EF81, EF91, EF92, EF95, and others.
Check your manual for one of these hoop part/model numbers.
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