Step 6Making the Frame
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First make sure your rollers roll in the PVC channel smoothly, and the two pieces of wood are parallel. Measure the distance from the outside of the two boards. This will be the length of the cross boards. Cut two of them and put them in place as shown in the picture below, vertically. Do this on each side. A brace in the middle is not necessary, i didn't use one and mine is sturdy, but you can place one if you want. Nail or screw these in and use glue if you want, I did, wood glue is very strong.