I can email you a file that covers the gear selector mechanism assembly in some detail.
When you have it assembled you need to have the spring clip (15-4240) on the operating shaft otherwise the ratchet lever (plate) will tend to slide out and the pawls will not engage. It is a fiddly operation to get everything together and keep it that way until it is secured.
I have sent you an email. I think the majority of my issues were that the double nuts holding the pawls were tight together but not to the plate allowing 20thou play in either direction which made them feel very sloppy, i adjusted these last night but i am currently at the stage where the circlip needs to go on then i can start adjusting the selector arm hopefully. Going to have abit more time on it tonight.