A few years ago when I first made up some Upper Entrance Rims, I made a few that had screens inserted where I usually used a piece of wood, so the bees alighted on a platform of screen instead of the wood. Recently I installed cleats onto all of my supers, then I realized that the best way to use my older entrance rims was to install them upside down with the bees entrance then facing down. When I positioned some of the entrance rims with screen platforms I observed that it acted much like the typical "Robber Screens". This link is to plans for such screens Upper Entrance Rim Robber Screens