Arthur Shaw Rim Lock help with parts

[ColinM]

Hi
I recently purchased the above Rim lock and have renovated it, I have since made a key for it - very simple which is a good intro for me. There is a part missing that I believe holds the dead bolt in the in/out position and I assume a spring to help tension this item (based on other rim locks I have). So the question is does any one have a picture of the inside of this lock so I can see what the items look like, I am happy to make the items if only I knew what they look like. Does any one know how old this lock is ?