You know it's the little things like "The disks fit perfectly inside a 5 gallon bucket." that make life so much easier. Although my team is opposed to it I want a 5 gallon bucket feeder; THE DISKS DO NOT OVERLAP. At least not enough to worry about, they way they curve the edges go out and back in preventing one from falling all the way on top of the other so you con stack them one on top of the other and push the one on the bottom out without affecting the others too much. Here is a good example
http://www.youtube.com/watch?NR=1&v=JziVZvfsA3c.