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Soaking and tapping, use padding and tap and drop the item repeatedly, nothing savage, enough to help the WD-40 through the grooves and potentially dislodge some grit and grim.
Other option freeze something with the same ID and use it to cool the internal ring, while using something pretty warm on the other one to twist with.
Taping over time can work very well, just make sure your liquid is running into the gap/grooves.
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