Intended for the shoe and boot market, Judson’s device has all the recognizable parts of a modern zipper — rows of interlocking teeth with a slide mechanism to mesh and unmesh the two sides.

Now you can take off the old zipper slider. Take your new zipper slider and position the zipper teeth into the top grooves of the slider. Push them through to the bottom. Next, pull the zipper ...

This one seems impossible to fix, but [Magic Stitches] cuts into the static side about five teeth from the bottom, slides the head back on, and sews the bottom of the zipper together. This one we ...