: Hold both tape ends firmly and pull the slider down onto the teeth. If the teeth don't align correctly, remove the slider and try again to avoid a bulging track .

: For very long pieces like parkas or large bags , you can add two sliders facing in opposite directions (back-to-back or head-to-head) to create a double-ended zipper.

Slide the first side of the tape into the wider end of the zipper slider.

Insert the second (shorter) side into the other track of the slider.

: If you are struggling to hold the slider while inserting the tape, try sliding the pull onto the prongs of a kitchen fork to hold it steady.

: Trim one side of the zipper teeth down by about 1/4 inch. This creates a "lead" that makes it easier to guide the slider onto the other side first. Insert the Slider :