Braun novamat 515 af slide projector

Hello all, I took the slide projector casing off as fan was clearly catching on something.
Whilst lid off fan worked fine.
Now it won't fit back together.
Has anyone got any tips please?
I think it's to do with the parts pictured.
Can't see how they fit and the grey lever doesn't connect to anything obvious.
If anyone has a manual of the internal workings that be great.
Or any tips.
All help welcome.
Thank you