If you can weld or have someone weld, the rest is easy with proper technique. The video is a good general procedure but there are a few improvements that can be made easily.
The VERY fortunate part is that the piece is a separate piece that can be removed and fixed or replaced. This job is VERY doable, medium welding skill needed.
There may be an easier fix but not sure. I would have to better pics, close ups of inside of pocket, better lighting and a pic of the outside where hinge bar goes thru. Also, how was the hinge attached to the door by previous owner?
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