Cigar lighter Question?

I'm hooking up the stock cigar lighter in my 72 Demon 340. It appears that all I have to do is run a 12v switched power @ 15 amp fuse for protection. I tested the socket with a 12V power supply and it worked fine. My question is how do I remove the socket from its holder? Also does anyone know the size of the nut for the "power" stud on the socket. I'm going to use it for a gps,phone charger ect.

Thanks
Tom