I found my ash tray fiberoptic light, I guess that is what it is. Fortunately all the pieces are there, socket, cable and "thing" (black clip thing) to attach it to the ash tray.....but I was wondering, do these things actually work?....meaning do they actually provide light to the ashtray through the cable? Any recommendations to clean the ends of the cable....I think there might be some black paint that got sprayed on there. Just lightly sand the ends or?