I have what I believe is a CVA drop-in bore light. I have no instructions for it and it does not work. Does anyone have or know the battery size and assembly instructions? It is a brass "barrel" with a knurled knob at one end that can be turned into or out of the brass "barrel". The other end has an LED light with two stiff wires coming from it. One goes through a piece of plastic material then bends at 90 degrees across the bottom of this material, the other does not penetrate the plastic piece it is just bent over the edge of the plastic piece. Then there is a brass ring that screws down to hold the bulb assembly in. There is also a rubber "O" ring and I have no idea where that goes. If you have one maybe this will make sense to you. Any help appreciated.