How do you unfold a futon transmission.?

Posted under sofa futon

I'm assembling a mexican futon(sofa+couch) and the instructions asks to unfold the two transmissions.

I can only extend them to a v shape like the top transmission in the link below.

I'm supposed to extend them like the one with the letters below but can't.

http://www.futons.net/browseproducts/Futon-Hinges-Set-(Triple-Click).html

Do you have any scrap wood around to screw to them? Doing this would make it easier to flatten them.

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