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This is a method for rearing queens that doesn't involve grafting so it lends itself to people with poor eye site. Also this method avoids the problems that you may have with just doing emergency queens by just removing the queen. Some feel that the problem with emergency queens isn't that the bees didn't know what they were doing and used larva that were too old, the problem is the orientation of the cell and if the bees can't tear down the cell wall, they have to float the larva out of the cell and to the proper orientation. Through this process the larva losses access to the royal jelly at the bottom of the cell and ends up less well fed.