Use the pin to feed the ribbon into your casing. If your ribbon has a “right-side” (like mine), be sure that it’s facing toward you as it goes inside the casing. Hold the safety pin in your right hand while you gather fabric onto the pin with your left. Then, grab the pin with your left hand and use your right hand to pull the fabric off the pin. Don’t let go of your pin! Keep repeating that process (push, push, push… pull, pull, pull) until the pin makes it all the way around your drawstring bag.