Gloster Javelin Gunsight

Hi every body
I’m new on the forum and i need a little help…
I’just touch an old MK7 GGS gunsight from a Gloster Javelin.
It is complete but in a bad state… I’d really like to restore it but i do not want to go far without any documentation.
Is one of you know where i can find the technical manual of this gunsight ?

Big big thanks 🙂

Best

Matt from France