Over the past six months or so I've bought several pieces of electrical equipment that have heavy, 2-pin power plugs. As soon as you push one these in to a normal adapter, the weight of the plug pulls it out. In some cases I've had to resort to using insulating tape to fix the plug and adapter together.
I spotted this bit of kit on Amazon and thought "it's simple and cheap but does it work?" Answer, a resounding "Yes!" Unscrew the clamp screw, push your plug unto the slot, tighten the screw, push the whole thing into a 3-pin wall socket and switch on. It works. No radio cutting out with the slightest touch on the cable, no router disconnecting every time the cat brushes past. One of life's little frustrations gone forever.