This is my first year keeping bees and I purchased a couple of wooden top feeders to start off a couple of new packages in 8 frame equipment. In no time at all the bees started building burr comb in the feeder entrance. My reading about beespace (3/8") says if more space is given the bees will build burr or bracing comb. That being the case, why do the manufacturers of wooden top feeders have an entryway of 7/8"? The feeders I purchased were from Dadant and had no screen, just the entryway, then over the board, and a little wooden raft on each side. I don't know if other manufacturers have a 3/8" entryway. How about you folks? What is your experience?