I had a MH jacket that I used a lot and loved and the zipper failed even though the jacket was still in very good shape. Couldn't justify paying someone else to replace the zipper so I bought a new zipper and replaced it myself. A PITA but I figured it was worth the time and effort. By the time the replacement zipper failed, the jacket was failing as well.
I've had other jackets with failed zippers that I wanted to continue using but didn't want to fool around with replacing the zipper. On some of those, I added snap fasteners. I have a tool that makes installing snap fasteners quick and easy. Not as good as replacing the zipper, but functional enough.
Of course, having some sewing skills and the right materials and equipment helps. But I installed the replacement zipper on my MH jacket by hand-sewing. Not pretty if one looked closely, but it held up.
daveg, you make me remember way back when I lived in Seattle in shared housing. One of my roomies was big into backpacking, and in fact I owe him a lot for me being the backpacker I am. Anyway, he discovered I had a little sewing machine and taught me the fine art of “it just has to work, it doesn’t have to be pretty.” When he replaced a zipper in a fleece the ends didn’t come out even. So he just folded the extra over, stitched it down, and went hiking.
I’ll be checking out the video for tips. I need to replace a couple of zips in garments I really like.