July 2019 Introduction: I’ve removed the video that I originally uploaded with this post because I don’t think it’s a good idea anymore. Screen stapled over the middle of the hive top feeder, for me, is the way to go now. I also staple screen inside the reservoirs on the bottom to prevent the bees from getting into the reservoirs when they’re empty. See Screened Hive Top Feeder for more details.
I have no love for hive top feeders. They can be heavy and messy and a farcical tragedy when things go wrong. But this simple and cheap modification virtually transforms them into kill-free feeders and, at least in my experience, makes them easier to use. It also allows me to put various rims over the feeder, or anything I want over the feeder, without risk of drowning any bees. Obsessive-compulsive mad scientist beekeepers (a significant portion of the beekeeping demographic) could easily build on this design so that the feeder virtually refills itself. I can already imagine how that could work, but I digress.