Dawn,
My 401A has one of those beige adapters because it has it's bottom case like yours did. When I got it there was no power or foot controller cords to it so we bought a set from Sew-Classic. The foot controller part number is: SCE197626-CP. That's the standard non-electronic one. My wife also likes it much better than the factory Singer unit with the little stump you gotta push on.
Considering the electrical contact looks to be a sleeve, I'd get a small sheet metal screw and screw it into the broken off part and use that to pull it out.
Joe