Step 12Assemble frame
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It is helpful to have a helper for this step. Stand both of the windows up in the base piece and make sure they are firmly seated in the grooves and in the caulk. Next apply a small amount of wood glue to the ends of the base piece where they meet the sides. Holding the windows firmly, put on both of the sides, ensuring the windows are in the grooves, the frame is square and the window is sealed all the way around. Adding the screws after putting on the sides will ensure the frame is held securely together at the base.