Can you use imovie's green screen feature to make things invisible?

Hi,
i have a GoPro, and am making a mount that will give me a 3rd person view while i snowboard.
Like this: https://s3.amazonaws.com/ksr/assets/000/333/633/7ac3cbc3da3b7b2c948f36e6018ea460 _large.png?1357825021 (but home made)
However, the tube will be in video, it would be great if i could edit it out...
I was hoping that i could paint the arm of the mount green, and use the green screen function to edit it out in post. like the skate boards in this video: http://www.youtube.com/watch?v=654lUYIhYk0
I have looked around online, and it seems that the green screen function in iMovie sems limited to just backgrounds...
Any advice?

Excuse the delay in replying...
Excellent! - thanks for that xnav
It work even with the delay set to 0.0 on the iPhone Simulator, but not sure about on an iPhone though.
I think I need to read up about @selector and the performSelector instance method.
I found today another possible solution (but have not tried it out though):
http://simonwoodside.com/weblog/2009/2/5/howto_make_aniphone/
Thanks again

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    Excuse the delay in replying...
    Excellent! - thanks for that xnav
    It work even with the delay set to 0.0 on the iPhone Simulator, but not sure about on an iPhone though.
    I think I need to read up about @selector and the performSelector instance method.
    I found today another possible solution (but have not tried it out though):
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    Thanks again

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