See if this works with your machine
The Brother Bobbin Center Pin converts smaller 9.4 "L" sized bobbins to fit 11.5 "15J" size bobbin machines. Mostly used with prewound bobbins.
Part Number: BRO XD0835051
Alternative Part Numbers: XC8450051, XF5048001, XC8661251, XC8661151
Guaranteed to fit because it is a part.