Door knobs sometimes fall off, but they can easily be replaced. Learn how to fix a door knob that fell off.
doors - How can I fix vintage glass doorknobs with loose glass-to-brass connection? - Home Improvement Stack Exchange
Thoughts on how to fix this.. knob fell off and the door is hollow : r/DIY
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My friend's doorknob fell off the door in his 75+ year old house. How would I fix this? (more in comments) : r/DIY
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