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I'd be willing to bet the guards that came apart were installed like your photo, with no space between the guard and the tensioner. Watch a video of the tensioners in action and they bounce around quite a bit. With no space for plunger movement they will simply hammer themselves off. From the witness marks on RDMs failed guards, that is what it looks like to me.
Failed o-rings, that is what my tensioners suffered from, same as yours. Probably all of them.
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