6. Sew the zipper

■ Place the fly panel with the inside facing up, then measure 20cm from both sides along the seam of the front flap.

■ Take the zipper and separate the two sides. Take the one with the slider and set it apart, it will be sewn on the door panel.

■ Place the top of the zipper on the 20cm mark on the left making sure that the teeth are facing outside, towards the flap.

■ With the zipper in place start sewing keeping the teeth of the zipper on the left of the needle. Sew until the mark of the 20cm on the other side. If your sewing machine has the ability to do it, do a double needle top stitch otherwise you can sew it doing two rows of stitching, one after the other.

■ The zipper will be certainly longer than the dimensions marked. When you reach the 20cm end mark close the seam and cut the zipper leaving 1cm after the last stitch.

■ To create the zip stopper where you did the cut use the same silicone glue that was used in step 2. Place a little drop of glue on the teeth just before the end. Make sure that the glue goes in between the teeth so that it will stop the slider.