Fixing a sagging door - GIF

[cmarlow]

As an old carpenter I can say well done to your video. I have used this trick quite a few times, sometimes even on new doors.
I like the mod you did to the hive tool. Since I use the hive tool more as a scraper I and would prefer a clean scraper edge I use a little pin punch instead. I avoid using my nail sets for anything except setting nails, once that cup point is gone a nail set is no good as a nail set.
The first thing I check are the screws and often shim the hinges for proper clearance but Sometimes cheap hinges come with the wrong swage on them, right out of the box.
My tool of choice for resetting the swage is a pair of waterpump pliers with plastic jaw pads, but vice grips are good too. I found adjustable wrenches tended to get in their own way because of the 15 degree built in angle, especially when close to a wall. Be careful about leaving tool marks on the hinges because the metal can be soft on cheap ones.