We had experimented with unrolling the bales the year before and had decided to make a device that would let us move them with the horses and then unroll them. I used square tubing to make a simple frame with two arms attached to a cross piece which connected to a tongue. Small diagonal braces made the arrangement rigid and the arms had a right angle piece of square tubing on their ends which allowed a pin to be driven into the middle of the round bale from each side.