Transforming deluxe 08 Bumblebee

I'm having trouble transforming the upper body back into the Camero's front end. A part used in the hood of the alt mode can be used to lock the upper body into place; I forgot I had it in place like this and I think I did something to mess it up. I'd like to know how to fix it if I can. If there's been another thread about this, can someone point me to it, because I haven't been able to find it.