We bought two crystal chambers complete . We climb one and bought the engine advised by Ammnra . But unfortunately, at first using the gear that rotates the crystal chambers broke in two. So we decided to use the second pending the response of Ammnra regarding the possibility of making another gear and there surprise the second gear is dislocated ... So far with no new Ammnra , I can not advise you that this is only a smokescreen for us.