We have PVC pipes on a chain at our stands.. If i get out to one of them i'll post a picture but i bet if you google it you'd find what i'm talking about. Its just a big pipe with small holes drilled in it. The pipe has screw on ends and one end has a chain that is tied to a Tpost by a ring. You fill it with corn, close it up and wait. The pigs find it and roll it around to get the corn. It takes hours of rolling to get all the corn out and they will spend hours rolling it. We even have a couple with false areas full of rocks so that it always sounds like there is corn in them. We get them to these pipes and then cage around them with a one way door. Sometimes we'll get over 10 at one time. The pipe keeps them from just devouring the corn in one night and it keeps coons from eating it. The coons can still eat it, it just takes them forever and the pipe can be to heavy for them to move to dispense more out..