I have an exterior metal door that uses a vinyl/foam V shape weatherstrip that sits in a 1/4" kerf. I need to replace it because it no longer creates a good seal with the door. I can find similar weatherstripping at the local big box stores but they are all designed to fit in a 1/8" kerf. Any suggestions on where I can find a replacement or is there an easy way to modify my existing door to accept the weatherstripping with a 1/8" kerf?