Oh....I see. I posted in the other thread wondering what seal you're referring to.
I don't recall the o-ring when I'd had mine apart. Can you take a pic? Otherwise, I'd have to pull mine off again (and it was sooo much fun) to know what you're talking about.
At this point, all I can tell you is the valve/plate is supposed to pass air through the large eliptical hole when cold, and then shut when it's warm. So, it appears that function is operational.
Maybe you could describe where the seal is within the valve?
Edit: So I'm sure we're on the same page, does yours look like this? It should.
