Head rest release?? (pics)

I recently bought some head rests for my car. I was wondering if anyone knew if you can remove the existing ones without taking the seat back apart? They have three notches in the posts that go into the seat, two of the notches are pie or wedge shaped and the last or lowest notch is angled on both sides. I was really hoping that I wouldn't have to open the seat back to do this. Tricks, tips, or tried and true methods will be greatly appreciated. Thanks.


Not the greatest pictures but I'm sure that you all see what I mean.