Inverted feeders. My bees are taking a qt. a day. The hives w/qt. mason jars are running me crazy for the last 2 weeks. Use something bigger. I have some with the plastic 1 gal buckets like the commercials around here use.
I have a 1 1/2 hole on my covers, offset to the side, away from the brood comb. The ones with the qt. jars have a block of 1x4 with a hole cut in it to fit the jar lids. The ones with the 1 gal feeders, I make sure the holes in the lids are on the "downhill" side of the hole in the cover. I haven't had any problems except with some leaky seals on any of them. The leaky seals still airlock, just gets bees all around the lid on the feeders. I use finishing nails to put my holes in the lids, like Brian said, from the inside out. I find it less hassle from the bees to change/refill them at night. Grab it, brush the bees on the lid to the cover, refill it, they have all retreated back into hole when I come back with it. Also, if I have to change in the daytime, I invert the feeder over the hole so it syrups the bees that are pouring out of the cover hole. I squish fewer bees :( that way when setting it down and get beebit less :). I don't have a rain/moisture problem, It seems to run around the blocks and lids. I also just put the metal AC duct tape on the inside and out side of the holes when not feeding. Guaranteed proped over in no time.