I want to hang some heavy stuff on my walls, but I know there's ductwork directly behind the drywall. The 3M hooks only seem to hold 10 pounds, and they don't recommend using 2 together to hold 20 pounds, etc. Does anyone know of other products that will hold heaver items (50 pounds or so) on the wall without putting anchor bolts in there, or otherwise putting holes through the drywall?
It is not the same as a screw threaded and embedded into a metal or wooden stud.