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Correct it was 1 tooth out and yes they are a swine to fit when chain is new. You do know that you do not use a screwdriver in the adjuster slot dont you
New chain and new tensioner can mean little movement, can not repeat too often DO NOT turn that slot in the screw with any tool
The tensioner mechanism looks good and turns freely and spring adjusts on the bench the same as when it is installed in the engine. The problem only occurs once the chain is fitted to the cam sprocket and camshaft, My worry is if the new cam chain is too short making it too tight