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I guess anything is possible as far as rebushing the tensioner strut but I don't know of anyone who has tried it. I think I still have the strut pictured in the other thread in my shed if you wanted one to practice on. As far as I know the internals of the strut usually outlast the bushes.
The bearing in the pulley attached to the tensioner also have a habit of failing but the bearing CAN be replaced without replacing the complete pulley.