I have a WaterWorld with a row out and I want to replace it but am unsure of what specifically I should be looking for. From what I have read the Gottlieb/Premier DMD's run at a lower voltage than all the other brands, this is at least in part why aftermarket vendors like ColorDMD have yet to add support (as I understand it). But if they are in fact different, then why do all the replacement DMD's that I find claim to work for all brands? Marco, Pinball Life, and others sell replacement units within a few dollars of each other and claim to work in most if not all System 3 machines. What am I missing? Please help me to understand. Thanks!