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Hi, welcome to Just Answer. My name is*****'ve attached the workshop instructions for replacing the chain tensioner below.
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Yes you can reuse it. You just reinstall the tensioner. You do not need to reset this type of tensioner.
I sometimes place it in a vise to compress the plunger but if you simply thread the tensioner into the housing and tighten it slowly it will compress.
Just checking in. Did you get the tensioner installed?