I just set up a new monitor arm. Chinese vendor said it holds up to 6.2 pounds. My 27” Dell gaming monitor is 4.2 lbs, but the arm sags no matter how I torque the joint down. I missed the 30 day return window by a month because of all these medical dramas.  Guess I’m out $60. 

 @40cd5708 Loosen bolt, insert sandpaper scraps between surfaces, retighten?