Simply cut the zipper to shorten it using side snips. Press the top stop over each cut side of the zipper at the end that finishes last and bend over the tabs with pliers. Two top stops are required, one for each half of the zipper.
Read, more on it here. Thereof, how do you fix a zipper without the stopper?
How to Fix a Zipper (without Replacing It)
Also, why is my zipper opening? One of the most annoying problems with a zipper is when the teeth won’t close. Over time, the slider starts to come apart, and when that happens it stops clinching the zipper teeth together. Grab some pliers and try closing the slider together until it catches the teeth again.
Beside this, how much should a seamstress charge to replace a zipper?
Do dry cleaners fix zippers?
Modern Dry cleaning process, in and of themselves, will not damage a zipper. But sometimes the dry cleaning solutions can make a zipper not slide very well. This sliding problem is usually easily fixed by applying some zipper lubricant to the zipper slide.
How do you make a zipper glide smoothly?
To help unstick your zipper, you can add lubrication to the zipper teeth using chapstick, crayon wax, the end of a graphite pencil, petroleum jelly, and other waxy products or lubricants. For all of these uses, make sure to do a spot test to ensure that the material you’re using won’t permanently stain the fabric.