I know this is later than your original post but, I bought a used Optima Pro and did the same thing. I have spent days looking for schematics for the trigger and have little luck and seeing that most forums complaining that CVA would not help. Now that BPI has taken over it seems thing are going better. I emailed BPI customer service and they responded quickly with a schematic, which I have attached here. Hope this helps and thanks to Jason at BPI Customer Service.
thanks for puting the diagram up. I would never have goten this back together with out it i used the paint brush handles mentchened earlyer in the thread. still took some time to get it together but would of taken for ever trying to figure out where the springs went.