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First. Make sure you're threading it in the correct direction.
Get a torch. Heat up the ring, not the threaded body. Get that fucker hot. 4-500F
Wire brush the threaded body.
Blast threaded body with brake clean. Wipe.
Spanner on the ring, and hit it with a rubber mallet. You'll hear a crack.
Once it's loose, thread the ring towards the cleaned threads.
Wire brush some more, and add Never Seize.
Keep threading both rings back and forth until it spins freely, making sure there's at least a thin layer of never seize, or WD40. If it doesn't, keep cleaning.
You probably have rocks/pebbles stuck in the threads. It happens. When I cleaned the threads on my coilovers, I had a handful of little rocks/sand from all 4 corners.
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