Yes. If you look at the sockets you'll see copper wires in socket grooves, bent over towards the outside of the socket. You can insert something behind this wire, between it and the socket wall, and bend it forward. It won't take much, just a tad. I use a small flat blade screwdriver (very small, like one for eyeglasses). BE SURE TO TURN OFF THEN UNPLUG THE AMP FIRST!!!!! :-)
FWIW.
FWIW.