Lokko Bell Lock Plug Puller Complete Professional Set - Includes 30 pull screws and cam turnerFree UK delivery over 30 Royal Mail dispatch European delivery available 30 pull screws included Lokko emergency access Your Key Is Missing. Pull out the Plug and Open the Door A bell plug puller is the locksmith's version of a dent puller. You anchor the bell over the face of the cylinder, bite a self tapping screw into the plug, then wind the puller down so it draws the plug straight out. The core comes away, you turn the cam, and the door opens.