Cut kerf slot for weathersealing

New 8 Meters Kerf Weather Stripping Seal Strip for DoorsWindows kerf slot We have 5 exterior doors The weather stripping has become smashed and longer seal very well The problem I have run into is that the kerf is bernstorff slot New 8 Meters Kerf Weather Stripping Seal Strip for DoorsWindows Frame Q Foam Card Slot Installation Sealing Gap 5 to 16mm Feature:

giga slot 88 Weatherstripping for doors with Kerf slots Silicone seal is longlasting and high durability Comparable to ZERO 8004N