Windscreen wiper blade

[Ollie_3151]

I asked the the local ford guy to change the windscreen wiper blade while doing the 3000 km services on the Mondeo. He smiled and said don't ask me to do that because they cost $160. They only sell the whole windscreen wiper assembly. So I can easily get the wind assembly off, that is no problem. What I don't want to do is not damage the windscreen wiper assembly while I am changing the blade. Does anybody have a suggested method to pull it apart with out breaking it?

Cheers
Ollie_3151