Charles Idea is a good one, IMO. 4 pieces cut with a 'V' at one end to join in the centre. Another alternative might be to make a cross out of square stock with a dado cut into each piece where they join, then after they are secured as one piece, router the inside edges to make it purdy. If you don't mind spending the coin, get a wainscotting bit to make a perfect join...probably not practical unless you have some other projects to use the bit on. Other than that, a tube of caulk for $1.99, can hide a whole lot!

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