From now on I will read all the posts on a subject before trying something, not just the one that directs me to the info to take the thing apart!
90 minutes and a great deal of swearing later I got it back together. Used a cut case, the last half inch 'blutacked' onto a 4 inch C clamp. Screwed in all into place before replacing the clip with a slight press of a pair of pliers.
Of course before doing this I spent 85 minutes trying all manner of different ways to try to get to to go together, with pins and springs flying around the room. Come to think of it most of the 85 minutes was spent on my hands and knees looking for parts!
Can safely say that the cleaning of the bolt will only be on a 'needs must' basis from now on.