The downside to this position is VERY low. You receive the .40 credit and that is yours, but you are on the hook for every penny below $4.00 corn goes. Even if corn trades at the March yearly low @ $3.65, you will be a nickel ahead. It won't go that low this year.
Below is the Dec corn put chart. If you are having trouble putting in the order, have your spouse do it for you!