Hi Barry There is information about the "Cloake" system at http://website.lineone.net/~dave.cushman/method2.html The details and dimensions are to suit UK hives but they can easily be adapted to suit whatever you have in use. I am just about to start a batch using this system and there will be a sort of running commentary on IBList Regards From:- Dave Cushman, G8MZY Beekeeping and Bee Breeding, http://website.lineone.net/~dave.cushman IBList Archives, http://website.lineone.net/~d.cushman