STERN SPIKE & SPIKE 2 - 4-Button Service Assembly for Coin DoorSTERN SPIKE & SPIKE 2 4 Button Service Assembly for Coin Door 4 Button service assembly with plastic mounting bracket for most Stern SPIKE & SPIKE 2 machines, most Jersey Jack Pinball machines & most Chicago Gaming Company machines. There are some sub par service button assemblies out there that do not make good contact with the buttons. This makes for a very glitchy experience. These assemblies are not those assemblies. These are the good ones!