Aight, cool. Glad to know it doesn't make a difference that there's a tiny amount of threading still visible. One of the people on the phone at the LBS was talking about using a cup and how it'd be "sub-par", but I wasn't really hearing what she was trying to say.

By the way turns out mines a UN54 and doesn't have that threadless ridge that the one you showed above does, the thread goes all the way to the end except there's possible a hair width length where they end. And yes there is 2 threads visible...