When the super secret back door unskilled shot sign on my Elvira House of Horrors pinball machine starts flashing it reminds me of a neon sign for a tacky roadside attraction. I thought adding a little neon glow to it might look cool. This mod is a fluorescent green plastic piece that fits behind the current sign. When the flasher behind the sign goes off it makes the fluorescent plastic have a neon green glow. Its a nice subtle touch to add a little more eye candy to this amazing machine. Installation only takes about 1 minute, requires no permanent modifications to the game, and is just as easy to remove if desired. Here is a link to a before and after clip of the mod installed: