That is brilliant. You don't mind if I borrow that idea, do you? I'm only allowed one a week now, and thinking of something like that early in the week ruins me.
It's a cheap Spectra oil cap from Autozone. $6.99. I bought the PCV from Napa, I just had them cross the EV228B number into theirs. $2.90. I have a step drill bit that was actually the perfect size.