The problem with changing just one part is that the remaining soft OEM parts are then subject to more force. It's like having two equal rubber bands connected to one another; when you pull them apart, they both stretch equally. If you replace one of the rubber bands with a thicker/stiffer one, then when you pull them apart the same distance as before (same force) the thinner/more elastic one will be stretched much further, because the stiffer one does not stretch as much.
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