To increase the capacity of a wheelbarrow, a shelf can be added to the space between the two handles. To make it, place a piece of plywood across the handles, and mark the position of the handles on the bottom. Cut the plywood to the width of the outside of the handles, and attach two cleats to the bottom of the shelf even with the inside of the handles to hold it in place. Holes can be drilled through the shelf to hold trowels and other hand tools.