Drilling a small hole for any leaking syrup to get out the FRONT edge furthest from the hive.... Never mind, its here...
http://www.outyard.net/feeding.html Using a boardman that way has worked VERY well for me... I have pulled factory style boardmans from a hive to find them packed SOLID with dead sticky bees. I have seen Syrup running out the hives entrance when the sun heated the jars and they leaked madly.. so I went searching for an answer, and made my OWN boardman feeders with a larger opening, Holes drilled in the edge furthest away from the hive so they could NOT leak INTO the hives, and then placed an entrance reducer and board to block would be robbers...
I dont use these much anymore, but NEVER had an issue with them when used as described, even when feeding weak hives later in the fall... Since I started using reversible inner covers, it is just so much easier to put the feeders and jars on the top, so the boardmans are gathering dust.
They DO have serious issues if used as they come from the supply houses.