There is a bit of difference between a Compur, and a Synchro-Compur, so make sure when you ask for advice to correctly identify the mechanism you are working on, so you don't get the wrong directions.
I've never taken a Vitessa L apart (wish I still had mine), but similar construction of the shutter/lens assembly would indicate that the second element is just sitting there, and is probably stuck because of all the lube contamination.
It also appears that the shutter speed ring is halfway off, so just lift it the rest of the way. You'll find the method the cover plate is attached after doing that.
Since all manufacturers used different ways of putting the shutter/lens assembly together, it helps to study several versions to see what you are up against.
Here are some I have worked on:
Take your time, and don't force anything.