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Yes, they are "reversed" (aka "left hand") thread. They could have done it either way, but left hand gives a more normal "righty tighty-lefty loosey" action on the tensioner. The threads aren't any more or less durable than any other metal/thread combination, but there are a few things that make these susceptible to damage. First there is a central bolt on the tensioner itself, if this is tight, the threaded adjuster rod isn't going anyplace.
Second, when tightening, if the tensioner is worn out, as it often is, when you tighten the rod (turning it clockwise or "right") the small arm the threaded rod attaches to will go alot further than it was designed to and hit some protuberance such as a bolt head, or exceeds the geometrical limit, meaning the rod hits the tensioner itself, and breaks the rod or the tensioner "ear" that the rod attaches to.
Gilly
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