If your door handles become loose, tightening them is a simple process that restores their functionality.
Insert the appropriate-sized Allen key into the hole, securing it into the set screw, and rotate clockwise to tighten until snug. After tightening, remove the Allen key and check the handle for stability by giving it a gentle jiggle—it should now be secure.
For smooth operation and security, regularly check your handles for any loosening.