Open-End Zipper
When closing pull the slider down completely until it touches the retainer box. Next, fully insert the separable pin into the box. (Incomplete insertion may cause problems.) While holding the insert pin side with one hand, pull up the slider with the other hand.
When opening pull the slider down completely until it touches the retainer box, then gently pull out the separable pin with your hand.
Two-Way Open Zipper
Zips will be ruined if they become jammed or if the two parts not fitted together properly on a two-way zipper.
When closing pull the upper slider down until it touches the bottom slider, then Insert the separable pin to the very bottom of the bottom slider. (Incomplete insertion may cause problems.) Then pull the upper slider up with your hand.
When opening the zip, pull the slider down entirely until it touches the bottom slider and then gently pull out the separable pin with your hand.