Sorry I'm just not convinced ... There are so many ways of getting so called no feeders to feed . One of the less well known and possibly one of the weirdest methods is to simply put the non- feeding Royal in a rub /tub with the heated d/f rat or mouse and tape something that vibrates to the outside of the container (use your imagination ) . This wacky method has a very high success rate and the rat is unlikely to blind the precious Royal .