On Mon, 22 Feb 2016 15:44:36 -0800 (PST), wrote:

Yep, what Jon said. Sorry, I'm not super familiar with electrical terminology (I'm a mechanical guy).

No you may not do that.

Why not just get one of those 6 in 1 outlets, that plug into to a
duplex outlet (like you have) and have a center screw so they don't
pull out when you pull out a plug. They come with 3 prong sockets.

These days, even a properly wired house is likely to have many more
appliances and little black boxes than the number of receptacles, even
if you don't use more than one or two of the big ones at once.