What is the little hole on the side of the door knob for? - Quora
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When deadbolt hole in door is too small
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What is the little hole on the side of the door knob for? - Quora
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What tools do I need to change the door knobs and lock on my front door? It's not a deadlock. - Quora
What is this hole in the side of my doorknob? Locked out so hoping it can let me back in : r/whatisthisthing
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Can you replace an interior door knob without removing the door knob lock? - Quora