Answer: disassemble the old handle and place a new handle.
It is very unpleasant to have to fight every day with a door whose handle is difficult or whose handle no longer works. Especially since we could stay locked in a room. You can easily fix it by changing it yourself. To make the operation as simple as possible, choose a handle similar to the one you are going to replace. First, remove the faulty handle by unscrewing it on each side of the door. Then remove the square metal rod that connects and holds the two parts of the handle. Place the new rod in place of the old one. Press one of the parts of the new handle onto the rod on one side of the door and fix them to each other by screwing them if necessary. Then do the same on the other side of the door with the second part of the new handle. Congratulations, you have completed the operation and you can test your new handle. You too, send us your brico question