Fitting vent window locks

[Bathtub57]

Whilst trying to close my drivers vent window the other day the whole latch assembly popped out. I've searched but haven't been able to find any info on reassembly.

From what I can find though I seem to been missing a spring and a spring washer. It seems there was a change in 67 in the way the latch fitted together. I just can't figure out how the pin locks the assembly in place? If anyone knows how this fits together, or even better has any pics I'd be very grateful.

Here's a pic of what I have



I'm more worried about security for now rather than drafts.

Cheers

Mark