Jack W4 Series - Page 56

拨线片：Thread dial, 针尖与动刀底面齐平：the bottom of Thread dial is aligned with the needle tip
图18（Figure 18）
紧定螺钉1：Set screw 1, 紧定螺钉2：Set Screw 2, 紧定螺钉3：Set Screw 3
图19（Figure 19）