Jack C4 - Under Looper Adjustment

2.Under looper adjustment
When the needle bar comes to the lowest point, the tip of
looper to the left needle is 3-3.5mm, the distance to the left
needle is 0.03-0.05mm.
3-3.5mm
Front and
behind
adjustment
screw
left and
right
adjustme
nt screw
Maintenance instructions