I think there are many people who are wondering how they got the chain through the drain pipe that was completely clogged with dirt, so I'll tell you the answer. The answer is that they put the chain in before the drain pipe got clogged with dirt. Since that place is often clogged with dirt, if you put the chain in before the dirt gets clogged, you can just attach the tire and pull it with the tractor. My father did that when I was young.