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accordion boot has a pinch channel running down both sides of it. basically, you just push it onto the metal on each side of the opening. i usually find the midpoint of the piece of material and start at the top center and work my way around both sides putting the seam at the bottom to try and minimize leaks. make an overlap flap on your seam and use silicone to seal it. if both your holes are exactly the same size, you should be able to put the boot in without wrinkles. starting at the top center also helps to minimize wrinkles.
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