These are the front porches I will screw over the slots on the front of the bee house. Each one will be a different colour to prevent drifting on so closely positioned entrances. This first one is white. This first photo shows the entrance reducer fitted allowing only one bee space utilized in a robbing scenario.
This next shot shows the metal piece turned around and allowing a gap of 7.5mm x 70mm which acts as a mouse guard.
Here the metal piece is removed and the entrance slot is fully open and will exactly correspond with the slot on the bee house front wall.