Require all mc feed-dogs, pressure-foot, feed adjustment, stitch count &thread tension to avoid puckering, feed-dog chew, shine marks, &distorted or stretched seam.

• 要求所有的机器送布牙、压脚、送布量、针数、逢线张力以避免起皱、狗牙反咀、反光、变形或者骨位拉松。