The photo of the parts is correct .
I added a bit of black grease to the pawl , the bit that's pushed by the spring , also some grease on the 2 shells , to try and capture them .
It is VERY tricky to assemble , you need thirteen tiny little fingers and a spare tongue to chew on .
I am guessing there might be an assembly jig of some sort , last time I decided to get into a '40 door lock , I gave it to the local lock smith to worry over
