Attach the stiles/face frame pieces removed earlier. Secure one stile to the back of one cabinet door on each of the two wide cabinets to seal the opening. Position the stile with part of its front face against the back of the left door and the remainder extending a couple of inches toward the right cabinet door. Secure the stile with screws and touch up the ends with paint. Close the left door first, and then the right. When both doors are closed, the stile should rest in the identical position it occupied before you cut it off the face frame.
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