I'm sure their are a lot of people that have done this, but I thought I would throw it out there for the folks that might not have heard of it. What you do is take a 4" PCV pipe cut it 4 to 6 foot. Take a regular cap on one end with a threaded eye bolt through the center. The other end you will use a threaded female with a threaded male plug. Once you glue all that together drill about 6 to 8 1/2" holes in the pipe. I use a steel dog stay with a swivel to attach it to. I use 5/16" "aircraft" cable with swivels to connect the pipe to the stay. You take off the threaded male plug to fill with your corn. The hogs will push it in a circle all night trying to get the corn out of the small holes.