Hi, I'm kinda stabbing in the dark but does that brass bit in the pic rise up a bit? If it does, your latch must have a hole in it, that fits on the brass bit.
The latch will only go one way, to catch the "slot" on the center pin. Once you get the orientation conquered, then the hair spring will fit outside, between the latch and the latch cap that is not in the pic, to allow the latch pin to move in and out with the hairspring making tension. You'll need to align the spring to fit inside the cap, as I see one arm is longer than the other.
In other maker's reels, the longer arm goes aganst the latch. Maybe not so with yours.
Hope this helps. KD.
PS: Several posters above have said much the same, so I'm not pulling a fedex, just _expanding_ on the above methods.
http://www.youtube.com/watch?v=zNCrMEOqHpc