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3-12. Adjust the play for the rotary hook plates.
3-12-1
Use a flathead screwdriver to remove the needle plate.
3-12-2
Turn the hand wheel in counterclockwise direction to let the
bobbin case touch the rotary hook holder plate(2) and form a
gap between the rotary hook holder plate(1).
3-12-3
The side with 0.3mm can pass the gap but another side
(0.5mm) cannot pass.
3-12-4
Remove the free arm cover if the play does not meet the
standard.
3-12-5
Loosen 2 setscrews for the rotary hook holder plate(1) and
adjust its location.
After adjusting to a correct play, tighten the setscrews.
