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I think G is correct , as Mark sent me a pic of the tensioner hole and there is a sleeve in there that the piston rod [ shiny part] slides in to. That would be where a circlip would ratchet..
The ones I have seen have a hollow , threaded nut that holds this sleeve and plunger in, but this does not ... so, I have no idea what holds it there [ if not just encapsulation from the cap]..
Anyway , that is where to look and check if the circlip was ever seen by anyone.......