By A Mystery Man Writer
Door knobs sometimes fall off, but they can easily be replaced. Learn how to fix a door knob that fell off.
How to Fix a Door Knob That Fell Off
How To Fix A door Handle That Fell Off
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I accidentally ripped off my doorknob. How do I fix it? - Quora
My friend's doorknob fell off the door in his 75+ year old house. How would I fix this? (more in comments) : r/DIY
How to Fix a Doorknob