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How can I eliminate flex in door jamb?
If the door pictured below is locked, and someone pulls quite hard on the outside handle, the door jamb will flex inward. There must not be good blocking behind the catch. I haven't tested to the extreme, but a hard enough pull might well cause enough flex to open the door.
Attachment 482165
I would like to eliminate, or at least greatly reduce, this flex without disassembling the door frame. Any suggestions? For example, is there something that could be sprayed or injected through a small hole and would then harden sufficiently?