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My ring also came loose, and after a lot of head-scratching I realized that the halves of the black plastic coolant hose locating "clamps" nestle together on top. I had loosened the lower one and slid it towards the front of the car, and that revealed that a curved tab on top is what must grab the filter retaining ring.
So I trapped the metal ring under the curved tab and slid the lower half towards the back of the car until the two halves were aligned again. Screwed the two halves back together, tightened the filter ring screw, and the filter was secure again.
Good luck!
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