Push button catch to toilet cassette door

I am trying to re-assemble the push button catch on the external door of my toilet cassette. On my Nuevo the door on the side of the body has a lockable push button in the bottom corner and an unlockable push button in the top corner. The spring of the top button had come out of alignment due to some rough Italian roads, meaning that the catch did not extend out to secure the door. I unscrewed the two screws on the inside of the door and released the inner workings of the mechanism! Out dropped three springs and two pieces of plastic. An ingenious device to operate the push button catch. However although I can work out how all the bits fit together, I can't work out how to keep them in p!ace while I screw the back piece into the door. Gravity dictates that most of the parts fall to the ground before I manage to get the assembly back into the door!
The only thing that I can think of that might make re-assemble a little easier, is to take the door off the side of the van, place it on a horizontal surface and then try fitting the catch assembly.
Has anyone managed to refit this catch and what techniques did they use?
Phil

Phil
Have you tried using Vaseline or grease to hold then in place
David

Had the same problem last year. Much easier if two people work together on the task.

You may find that the hinge pins can be pulled out and the door taken off and laid flat.  This is how my two door locks were replaced.  Hope this helps

sigmaman wrote:You may find that the hinge pins can be pulled out and the door taken off and laid flat.  This is how my two door locks were replaced.  Hope this helps

Hi sigmaman
Nice to see you back on again,how's the van doing 
Boaby

I put mine back together by first finding out what went where then holding together with sellotape until complete. Remove tape carefully before cover plate is replaced and secured. Took a couple of attempts but now OK