Hayward CC10092S leaking around Lock Ring

Hey folks, I've owned a Hayward CC10092S for the last two years - couldn't get the top open but finally did last week. That's great news because I could change the filter but bad news because now, after trying to screw the top back on, I'm getting a major leak around the lock ring.

I cleaned out everything, added some lubricant to the threads, but I'm still getting the leak. Are there any seals inside that I should be aware of? Not finding any documentation about this on the Hayward site.

Help!
 
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