I'm trying to take it apart to replace/clean o-rings. I've run into something that doesn't look like anything in the DIY videos I'm watching and I don't know how to proceed... there is a... plastic-crown-looking thing.
Fairly new, not overly common yet. Most new ones I have been installing still come with 1225s. The 1255 is mostly in the faucets with the lever on the side, but it's in a few top handles as well.
The black plastic "teeth" are independent of both the chrome and the black inside-threaded tube. I'm trying to fully disassemble so I can clean/lube the o-rings because the faucet has gotten hard to swivel around. Still confused about how to pull apart the remaining items without damaging. I can't find anything that looks like the "teeth" online.