You wouldn't want to draw much current through it with only those flimsy rivets holding it together. And as the pins get twisted back and forth you can imagine the whole thing loosening up.
Those plugs I showed are usually designed for small things that don't draw much power: electric blenders, radios, fans, etc.
The one I have at home is rated to just 10 Amps, I believe....and I doubt anyone that uses these ever runs them anywhere near that.
The pins are actually held in little plastic holders that pivot (and they're geared together, so they moved together and stay aligned). They're actually very easy to shift from one position to the other.
I'll take apart the one in my box-o-junk and put some pictures sometime later.
