Brother SL100 Service Manual page 37

Basic of Assembly
3. Tighten the screw (cup screw M3X20) temporarily to the back side of arm bed.
4. Attach the stopper plate to the back side of arm bed with the screw (screw, bind M4X8).
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Refer to 3 - 32 Assembly of Needle-presser module.
Stopper plate
Screw, bind M4X8
Bobbin winder, Upper shaft, Needle-presser module
Cup screw M3X20
2 - 25
Cup screw M3X20
Screw, Bind M4X8