Winshield Wiper Assembly??

Alright, I'm replacing the wiper pivot gaskets because I'm sick of having a pond under my feet when it rains. I noticed on the wiper pivots, there is a small washer (and it appears to be slightly warped on mine). How do I replace these? Is there a trick to taking these things apart?

Here's a picture of to give you a better idea of what I'm talking about:



It's the very thin washer under the black gasket...

Thanks!
Craig