The nylon zipper is sewn on one side. When sewing on the other side, you need to look at the position of the zipper mouth iron below. If you can avoid it effectively, then you can directly turn 90 degrees to let the needle Cross the zipper, then turn to the other side and start sewing. When turning the table, the needle should be placed in the position first, then the presser foot should be lifted, and the presser foot should continue to sew after turning the corner. When sewing over the zipper teeth, do not step on the motor, but turn the sewing machine wheel by hand and carefully pass the needle through the nylon zipper teeth to avoid breaking the needle.