easy fix.
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FH02NOV_02818_008
Family Handyman
Thread-Locking Compound
For mysterious, quantum-mechanical reasons, the screws that hold handles and doorknobs always eventually work loose. A few drops of thread-locking compound will permanently fix the problem, yet still allow you to remove the screw with ordinary tools if you need to later. A heavier duty variety is also available for large bolts and machinery. Did you know that brass doorknobs self-disinfect over time?