Okay, what you have to do is while the tabs are forward, you push them towards the outside (away from where your head would be) as you pull them back. If you look on the clips there's a thing on the outside of each one, that goes in the hole in the lens when it locks back.
If I still had my i4 I'd show a video.
You may call it fat, I call it bounce padding.
I'm a huge B///MW fan