当拨线片运行到最左端的时候，拨线片的勾尖与左针之间的距离为3.5mm（图20），
可通过松开紧定螺钉3来调节拨线器的左右位置。
1、Adjust the Height of thread dial
When move thread dial to the lowest position. The bottom of Thread dial is
aligned with the needle tip.（Figure 18） We can release the set screw 1 to
adjust the position and height of thread dial.（Figure 19）
2、Adjustment of anteroposterior position of thread dial.
When thread dial through the presser foot, the distance between dial and
presser foot should be 1mm (figure 18), we can adjust the anteroposterior
position by release the set screw 2. And then we can justify the distance
between dial and presser foot.
3、adjust the left and right position of thread dial.
When thread dial process to the leftmost side. The distance between dial
hook and left needle is 3.5mm. （Figure 20） We can adjust the position of dial
by release the set screw.
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