Brother BE-438F - Manual (Page 79)

9. STANDARD ADJUSTMENT
70 KE-430F, BE-438F
9-10. Adjusting the holding pressure (BE-438F)
Loosen the nut (1) and turn the nut (2) to the point where it
is just tight enough that the material will not slip out of place
when it is slightly pulled (keep pressure as slight as
possible).
9-11. Adjusting the position of the button clamp (BE-438F)
1. Loosen the two bolts (1) and adjust the button clamp
base (2) by moving it.
2. Carry out test feeding to check that the needle will go
through the button hole with no contact.
9-12. Adjusting the thread wiper
<Thread wiper height adjustment>
Loosen the two screws (2) and adjust
the thread wiper (1) so that the
clearance between the top of the
thread wiper (1) and the needle point
is approximately 2 mm when the
thread wiper (1) is aligned with the
center of the needle.
Note:
Check that the needle bar thread
guide (3) and the thread wiper base
shaft (4) are not touching at this
time.
2387B
2388B
2338B 2335B
Approx. 2 mm