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Message: <blockquote data-quote="KMixson" data-source="post: 522699" data-attributes="member: 432"><p>Start at the bottom. Place a piece the width needed in the bottom recessed lip and about 4 inches high. Then measure the distance from inside the top lip to the top of the piece on the bottom. Cut a piece that fits there. Push the top of it into the recessed lip at the top and then push or press the bottom of it onto the top of the piece installed at the bottom. You need to have the top piece as wide and as tall as you can get it since that is the piece that will be bearing the brunt of the load.</p></blockquote><p></p>