Use a jigsaw to remove sidewalls from the tires.

Fastening one piece of tread to another. Orient pieces with tread facing down.

Forming the loop at the end of the board.

Place the third section of tread under the second and overlap 6 inches. Secure this second union in a manner like the first.

Slide the fourth section of tire under the third and fasten. Repeat this procedure until the desired length of board is obtained. Adjust the length of the last section by cutting or simply overlapping the excess with the previous section.

Form a tight loop at both ends and secure with a minimum of two sheet metal screws. The loops need to be of sufficient size to accept a 5/8-inch diameter piece of rebar.

Using a jigsaw equipped with a hacksaw blade, cut 6-inch-wide pieces of rubber from sections of tread. The use of a tread-cutting jig makes this task easier.

Place these pieces of rubber on the board, tread facing up. Space the pieces on 18-inch centers and secure each piece with two screws, one placed an inch from the left edge and the other an inch from the right, equidistant top to bottom.

Rebar stakes inserted through these "pockets" allow the board to stand erect and be anchored to the ground. Overlapping sections of tread also serve as pockets. Take this into consideration when spacing the small pieces of rubber on the board.

When the board is finished, flip it over and remove the screw points, using a grinder. Repeat procedure for each additional board required.