The issue is in the pivot. The axis assembly assembly and handles are cake, but getting the pivot and blade in is a different story.
I did a complete disassembly on my well loved 940 when I got it from a pawn shop. I remember I used some trick to put the blade and pivot back in. But I can't quite remember how I did it. Seems like it was a small issue but that I resolved it fairly quickly. I want to say I assembled the knife and then put the blade in. Maybe? I don't remember off hand.