Laurence Edwards covers three essentials for queen rearing: enough nurse bees to care for grafts, plenty of pollen for brood development, and positioning the queen far enough away so workers accept the grafted larvae as new queens.
3 key things to remember: 1, you need enough nurse bees; 2, you need to make sure that you're giving them sufficient pollen; and 3, you need to trick those nurse bees into thinking that they're queenless. This method here does that by separating the queen a far enough distance from the grafts that are going in, and I think you'll agree there, those nurse bees have been well and truly convinced.
