Brother XM3700 Service Manual page 196

Adjustment Needle threader
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9. Loosen the screw 4 of the needle thread lever.
10. Move the needle thread lever up and down to adjust the clearance between the upside of the hook and the top
of the needle eye.
11. Tighten the screw 4 of the needle thread lever to secure the needle thread lever to the thread guide shaft.
4
Screw, Pan (P washer)
M2.6X6
Thread guide shaft
Needle thread lever
Needle
4
0.03 - 0.13 mm
Hook
Needle eye
4 - 43