18
3-9-6
Take the gauge (3.5mm) out.
3-9-7
Turn the hand wheel to raise the needle bar and make the
positioning plate touch the top side.
3-9-8
Turn the hand wheel to make the needle go down until the tip
of shuttle hook holder meets the needle from the front view
(but not physical touch).
At this point, the distance between the shuttle hook tip and
the needle eye should be between 0.5~1.0mm.
3-9-9
If the distance is out of the standard, the hook timing is set too
fast or slow (as pictures below)
3-9-10
Use a flathead screwdriver to remove the free arm base
cover.
