I bought this http://www.gabees.com/store/product_info.php?cPath=33_60&products_id=168 cover. I want to set it up for top entrance. There is a 1/2" "lip" that hangs down the front of the hive. If i put shims on it to raise it do I need to raise the lip above the top of the hive so the bees can just fly in? If the lip does not go above the top of the hive do the bees just land on the hive and crawl up and in? How high should the opening be? If I use some sort of "peg" to set the cover on does the open space on the sides cause problems? Do i still need an entrance reducer for the top to make a narrow opening?