Ok, I did a thing. Got Blue Demon tungsten electrodes used for welding (3/16" X7"), cut them up using a Dremel and glued them to the bottom of a Streamlight. I them covered them with bondo, sanded and painted it. Inside, I used tungsten weight used for pinewood derby cars to fill one of the battery compartments, filling the remaining space with more cut rods. I also used the tungsten putty from the derby weight kit to pack around the weights in the battery compartment to eliminate rattle. I made sure to place the weights to have conductivity in the battery compartment. Now, I have a working light (using only one battery) that looks stock and adds a nice heft to my CZ for relatively cheap. Heck. the new tungsten CZ quite rods go for $120 and I did my light for about half that (not including the light). And, I also made my own tungsten guide rod to boot! Just cut a rod to size, grind a small bump in one end, ground the corners off a nut and epoxy the nut to the tungsten rod. Easy!