Things You Will Need
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Place the section of plywood on a flat surface. Place one end of the chalk line at the top right corner and the opposite end at the bottom left. Snap the chalk line to form a diagonal line. Then place one end of the chalk line on the top left corner and the opposite end at the bottom right corner. Snap the line to form an X in the center of the plywood.
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Line up the floor flange to the center of the plywood. Drive one 1/2" screw through each hole in the flange to secure it to the plywood.
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Apply a thick layer of rubber cement around the entire inner lip of the flange. Apply additional rubber cement around an inch at one end of the 1-1/4" diameter PVC pipe. Insert the glued end of the 1-1/4" diameter pipe inside the floor flange. Allow the rubber cement to dry for two hours before continuing.
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Place a 1" diameter PVC pipe inside the 1-1/4" diameter pipe. When you are ready to bat, simply place the plywood base over home plate with the pipes standing upright. Balance the ball on top of the one-inch diameter PVC pipe and swing away. Switch between the 24", 30" and 36" section of PVC depending on the height of the batter.