Depends on how stiff? Sometimes it does take awhile for things to relax

You can try and spray some silicone in the channels to see if that help. Did everything go smooth in the installation of everything? I assume you replaced it all?
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derf
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My post are my opinion of what has worked for me but are not the gospel

What I post is what I do on my cars. I am here to try and help not to impress or boast