Does your jukebox have issues with the coin grinder, or is your coin grinder missing? Or do you simply prefer to have your pre-war Wurlitzer not require coins to play? This credit button will plug into your coin grinder spot giving you a credit after making a selection. It comes with a handy plug in the middle to ensure it fits through the back of the cabinet pre existing holes. Only works for the following models 700,800,750,780,850,950.